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    NGK IX Iridium Spark Plug Box of 4 (BPR6EIX)

    Vendor: NGK
    SKU: NGK6637
    Regular Price $37.60
    Fast Fulfillment: In-stock parts typically ship same day or next business day.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    Professional, Enthusiast-Driven Customer Support
    International Shipping Available - Contact Us!
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    NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

    • RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
    • Trivalent metal plating for superior anti-corrosion and anti-seizing properties
    • Outstanding acceleration, high fuel efficiency and durability
    • Fine iridium tip ensures durable and consistent spark

    This Part Fits:

    Year Make Model Submodel
    1967 Alfa Romeo 2600 Berlina
    1967 Alfa Romeo 2600 SZ
    1975-1977 Alfa Romeo Alfetta GT
    1975-1977 Alfa Romeo Alfetta Sport
    1981-1986 Alfa Romeo GTV-6 2.5
    1987-1989 Alfa Romeo Milano Gold
    1987-1989 Alfa Romeo Milano Platinum
    1987 Alfa Romeo Milano Silver
    1971-1975 Alfa Romeo Montreal Base
    1978-1979 Alfa Romeo Sport Base
    1977-1979 Alfa Romeo Sprint Veloce
    2007-2008 Arctic Cat AC 120 Sno Pro Base
    2006 Arctic Cat F120 Base
    2020 Arctic Cat Prowler Pro Base
    2020 Arctic Cat Prowler Pro Crew Base
    2000-2001 Arctic Cat Z 120 Base
    2001 Arctic Cat Z 120 Sno Pro Base
    2002-2005 Arctic Cat ZR 120 Base
    1958-1963 Aston Martin DB4 Base
    1960-1963 Aston Martin DB4 GT
    1962-1963 Aston Martin DB4 Vantage
    1960-1963 Aston Martin DB4 Zagato
    1963-1965 Aston Martin DB5 Base
    1965 Aston Martin DB5 Radford
    1964-1965 Aston Martin DB5 Vantage
    1965 Aston Martin DB5 Volante
    1965-1970 Aston Martin DB6 Base
    1965-1970 Aston Martin DB6 Radford
    1965-1969 Aston Martin DB6 Vantage
    1965-1970 Aston Martin DB6 Volante
    1967-1971 Aston Martin DBS Base
    1970 Aston Martin DBS V-8
    1967-1971 Aston Martin DBS Vantage
    1977-1978 Aston Martin Lagonda Base
    1972-1978 Aston Martin V-8 Base
    1977-1978,1982 Aston Martin V-8 Vantage
    1978,1982 Aston Martin V-8 Volante
    1972-1974 Aston Martin Vantage Base
    1969-1971 Audi 100 Series LS
    1980-1983 Audi 4000 Base
    1982-1983 Audi 4000 GT
    1982-1983 Audi 4000 S
    1986-1987 Audi 4000 Quattro CS
    1978-1983 Audi 5000 Base
    1986-1988 Audi 5000 CS
    1979-1983,1985-1987 Audi 5000 S
    1980-1983 Audi 5000 S Turbo
    1986 Audi 5000 Quattro CS
    1981-1985 Audi Coupe Base
    1986-1987 Audi Coupe GT
    1969-1972 Audi Super 90 Base
    1968-1972 Austin America Base
    1973-1975 Austin Marina Base
    1973-1975 Austin Marina GT
    1960-1966 Austin Mini Base
    1960-1966 Austin Mini 850 Base
    1962-1969 Austin Mini Cooper Base
    1964-1965 Austin Mini Cooper S
    1959-1967 Austin Healey 3000 Base
    1962-1967 Austin Healey Sprite Base
    1968-1970 Austin Healey Sprite MK IV
    1984-1989 Bertone X-1/9 Base
    1964-1971 BMW 1600 Base
    1968-1971 BMW 1600 Cabriolet
    1971 BMW 1600 Touring
    1966-1971 BMW 1600-2 Base
    1966-1968 BMW 1600ti Base
    1967-1971 BMW 1602 Base
    1968-1971 BMW 1800 Base
    1971 BMW 1800 Touring
    1971 BMW 1802 Base
    1966-1972 BMW 2000 Base
    1971-1972 BMW 2000 Touring
    1968-1969 BMW 2000c Base
    1968-1969 BMW 2000cs Base
    1968-1971 BMW 2000ti Base
    1968-1971 BMW 2000ti Lux
    1969-1972 BMW 2000tii Base
    1971-1972 BMW 2000tii Touring
    1966-1976 BMW 2002 Base
    1971-1974 BMW 2002 Cabriolet
    1973-1974 BMW 2002 Turbo
    1968-1971 BMW 2002ti Base
    1971-1974 BMW 2002tii Base
    1968-1971 BMW 2800CS Base
    1983-1984,1991 BMW R100 Base
    1976-1978 BMW R100/7 Base
    1980-1984 BMW R100CS Base
    1987-1995 BMW R100GS Base
    1994-1995 BMW R100GS Paris-Dakar Base
    1992-1995 BMW R100R Base
    1988-1993 BMW R100RS Base
    1988-1995 BMW R100RT Base
    1981-1984 BMW R100T Base
    1969-1973 BMW R75/5 Base
    1973-1976 BMW R75/6 Base
    1976-1977 BMW R75/7 Base
    1985-1987 BMW R80 Base
    1976-1984 BMW R80/7 Base
    1980-1986 BMW R80G/S Base
    1992-1994 BMW R80R Base
    1982-1987 BMW R80RT Base
    1982-1984 BMW R80ST Base
    1973-1976 BMW R90/6 Base
    1973-1976 BMW R90S Base
    1976-1979 Buick Opel Base
    1977-1979 Buick Opel Deluxe
    1978-1979 Buick Opel Sport
    1971-1975 Citroen SM Base
    1971-1980 Dodge Colt Base
    1976-1977 Dodge Colt Carousel
    1977-1980 Dodge Colt Custom
    1973-1977 Dodge Colt GT
    1990-1998 Eagle Talon TSi
    1967-1975 Fiat 124 Base
    1968-1981 Fiat 124 Spider
    1971-1979 Fiat 128 Base
    1976-1977 Fiat 128 Custom
    1973-1975 Fiat 128 SL
    1975-1978 Fiat 131 Base
    1979-1981 Fiat Brava Base
    1979-1982 Fiat Strada Base
    1979-1982 Fiat Strada Custom
    1974-1983 Fiat X-1/9 Base
    2004-2005 Gas Gas Pampera 125 Base
    2004-2005 Gas Gas Pampera 280 Base
    2003-2005 Gas Gas Wild HP 240 Base
    1969-1972 Honda 600 Base
    1975-1979 Honda Civic 1200
    1973-1974 Honda Civic Base
    1975 Honda Civic CVCC
    1973-1974 Jaguar XJ12 Base
    1975-1976 Jaguar XJ12 C
    1975-1979 Jaguar XJ12 L
    1976,1979 Jaguar XJS Base
    1971-1974 Jaguar XKE Base
    1972-1975 Jensen Healey Base
    1976 Jensen Healey GT
    2005 Kawasaki KAF400 Mule 610 4x4 Base
    1979-1982 Kawasaki KZ1300 Base
    1980 Kawasaki KZ1300B Base
    1983-1988 Kawasaki ZN1300 Voyager Base
    1976-1979,1981 Lancia Beta Base
    1976-1979 Lancia Beta HPE
    1979,1981-1982 Lancia Zagato Base
    1998 Land Rover Discovery 50th Anniversary Edition
    1994-1995 Land Rover Discovery Base
    1998 Land Rover Discovery LE
    1997-1998 Land Rover Discovery LSE
    1996-1997,1999 Land Rover Discovery SD
    1996-1997 Land Rover Discovery SE
    1996-1997 Land Rover Discovery SE7
    1997 Land Rover Discovery XD
    1976-1979 Lotus Eclat Base
    1976-1979 Lotus Eclat Sprint
    1958-1966 Lotus Elite Base
    1960-1961 Lotus Elite S2
    1976-1979,1983-1984,1988 Lotus Esprit Base
    1985-1987 Lotus Esprit S3
    1994-1995 Lotus Esprit S4
    1995 Lotus Esprit S4s
    1982-1988 Lotus Esprit Turbo
    1992-1993 Lotus Esprit Turbo SE
    1962-1975 Lotus Seven Base
    1962-1968 Lotus Super Seven Base
    1971-1983 Maserati Bora Base
    1967-1973 Maserati Ghibli Base
    1969-1974 Maserati Indy Base
    1974-1979 Maserati Khamsin Base
    1972-1979 Maserati Merak Base
    1980-1982 Maserati Merak SS
    1967-1971 Maserati Mexico Base
    1968-1969,1979-1986 Maserati Quattroporte Base
    1970-1971 Mazda 1800 Base
    1970-1971 Mazda 616 Base
    1972 Mazda 618 Base
    1986-1987 Mazda 626 GT
    1972-1977 Mazda 808 Base
    1972-1976 Mazda B1600 Base
    1977-1978 Mazda B1800 Base
    1978 Mazda GLC Base
    1977-1978 Mazda GLC DX
    1977 Mazda GLC LX
    1978 Mazda GLC Sport
    1976-1977 Mazda Mizer Base
    1966-1967 Mercedes-Benz 200 Base
    1968-1973 Mercedes-Benz 220 Base
    1966-1969 Mercedes-Benz 230 Base
    1966-1967 Mercedes-Benz 230S Base
    1963-1966 Mercedes-Benz 230SL Base
    1968-1972 Mercedes-Benz 250 Base
    1970-1972 Mercedes-Benz 250C Base
    1966-1967 Mercedes-Benz 250S Base
    1966-1967 Mercedes-Benz 250SE Base
    1967 Mercedes-Benz 250SL Base
    1973-1974 Mercedes-Benz 280 Base
    1973-1974 Mercedes-Benz 280C Base
    1968-1971 Mercedes-Benz 280S Base
    1972-1973 Mercedes-Benz 280SE 4.5
    1968-1972 Mercedes-Benz 280SE Base
    Shipping Policy

    Last Updated: June 2026

    We're committed to getting your order to you as quickly and transparently as possible. Here's everything you need to know about how we ship.

    Order Processing Time

    In-stock orders are typically processed and shipped within 1–2 business days of receiving payment, unless otherwise noted on the product page.

    Orders placed on weekends or holidays will be processed on the next business day.

    Processing times are estimates and may vary during periods of high order volume, severe weather events, holidays, or circumstances beyond our control.

    Backordered Items & ETA Listings

    Some listings display an estimated ship date (ETA). These items are not in stock at the time of order and will not ship immediately.

    ETAs are provided by manufacturers and suppliers and are not guaranteed. Ship dates may change without notice.

    By placing an order for an ETA listing, you acknowledge and agree to the estimated timeframe displayed on the product page.

    If you need to cancel a backordered item, please refer to our Refund Policy for applicable cancellation fees.

    Order Cancellations

    Once an order is placed, cancellations are not guaranteed, as orders are sent to fulfillment quickly.

    If you need to cancel an order, contact us immediately at sales@berryperformancesales.com.

    If a cancellation is possible, applicable processing fees may apply in accordance with our Refund Policy.

    Orders that have already shipped cannot be cancelled and must go through our standard return process.

    Shipping Costs

    Shipping costs are calculated at checkout based on the shipping method selected, package weight and dimensions, and destination address.

    Available shipping options and costs will be displayed before you complete your purchase.

    Estimated Delivery Times

    Domestic orders typically arrive within 1–7 business days after shipment, depending on your location and the carrier.

    Delivery times are estimates only and are not guaranteed.

    Delays due to weather, carrier volume, customs processing, labor disruptions, or other circumstances beyond our control may occur.

    Tracking Information

    Once your order ships, you will receive a confirmation email with tracking information.

    If your tracking has not updated within 48 hours of receiving your shipping confirmation, please contact us.

    Shipping Address

    Please ensure your shipping address is accurate and complete before placing your order.

    If you need to update your address after placing an order, contact us immediately. We will do our best to accommodate your request, but address changes cannot be guaranteed once an order enters fulfillment.

    Berry Performance Sales is not responsible for orders shipped to incorrect or undeliverable addresses provided by the customer.

    We are unable to ship to P.O. Boxes. Please provide a physical delivery address at checkout.

    Signature Requirements

    Berry Performance Sales reserves the right to require an adult signature upon delivery for high-value orders.

    Freight Deliveries

    Freight shipments must be inspected at the time of delivery.

    Any visible damage, shortages, or discrepancies must be noted on the carrier's delivery receipt before signing.

    Failure to note damage or shortages at the time of delivery may limit or void the ability to file a freight damage claim.

    If your freight shipment arrives damaged, contact us within 48 hours of delivery.

    Lost or Stolen Packages

    If your tracking shows your order as delivered but you have not received it, please:

    • Check around your property and with neighbors
    • Confirm the shipping address on your order
    • Contact the carrier directly using your tracking number

    If the issue remains unresolved, contact us within 5 business days of the marked delivery date.

    We will work with you and the carrier to investigate the issue.

    Berry Performance Sales is not responsible for packages confirmed as delivered by the carrier or for packages lost or stolen after delivery.

    Refused or Undeliverable Shipments

    Orders refused by the recipient or returned due to an incorrect or undeliverable address are subject to all applicable return shipping charges, restocking fees, and processing fees outlined in our Refund Policy.

    International Shipping

    We ship internationally.

    International orders may require a custom shipping quote prior to purchase.

    To request a quote, contact sales@berryperformancesales.com with:

    • Your country and full delivery address
    • The item(s) you are interested in purchasing

    International customers are responsible for all customs duties, taxes, brokerage fees, import fees, and other charges imposed by their local government.

    These charges are not included in shipping quotes and are non-refundable.

    Questions?

    We're happy to help before, during, or after your purchase.

    Email: sales@berryperformancesales.com

    Berry Performance Sales reserves the right to update this policy at any time. Changes take effect immediately upon posting. It is the customer's responsibility to review the current policy at the time of purchase.

    Return Policy

    Last Updated: June 2026

    We want you to love what you ordered. If something isn't right, here's everything you need to know.

    30-Day Return Window

    You have 30 days from the date your order is shipped to initiate a return. After this window, we are unable to accept returns.

    We do not offer exchanges. All approved returns are refunded according to the terms below.

    How to Initiate a Return

    To request a return, contact us at sales@berryperformancesales.com with your order number and reason for return.

    All returns must be approved by our team before any item is shipped back to us.

    Once your return has been approved, your item must be shipped within 10 calendar days of approval. Valid tracking information must be provided upon request.

    Items shipped without prior approval, without verifiable tracking information upon request, or outside this window may be refused and returned to sender at the customer's expense.

    Return Conditions

    To be eligible for a return, items must be:

    • Unused and in original condition
    • In original packaging
    • Complete with all original parts, hardware, manuals, accessories, and promotional items

    The following items are not eligible for return:

    • Custom-ordered products
    • Programmers and tuners, unless brand new and factory sealed. Any unit that has been connected to a vehicle, registered, or used to flash a tune is not returnable, regardless of packaging condition
    • Open Box listings
    • Installed, modified, painted, coated, welded, cut, or otherwise used products
    • Items marked as Clearance, Closeout, or Final Sale

    Products sold as kits, complete systems, or bundled packages must be returned in their entirety. Partial returns are not accepted.

    Items that include promotional products, discounts, or free gifts must be returned with all included items. If any promotional item is not returned, its retail value may be deducted from the refund.

    We strongly recommend test-fitting all parts before installation, painting, coating, or modification.

    Labor costs, installation fees, tuning expenses, diagnostic charges, rental vehicles, towing fees, downtime, or any other incidental or consequential costs are not reimbursable under any circumstances.

    If you're unsure whether your item qualifies for return, contact us before purchasing.

    Once we receive your return, we will inspect the item before processing any refund. We reserve the right to deny a return or reduce the refund amount if the item is received in a condition that differs from what was originally shipped, including signs of use, missing parts, altered packaging, or damage that occurred after delivery.

    If a return is denied, the item will be shipped back to the customer at the customer's expense. We will attempt to contact the customer to arrange this. Denied returns left unclaimed after 30 days may be disposed of at our discretion.

    Fitment Responsibility

    Vehicle compatibility information is provided as a guide only and may not account for all modifications, trim levels, production changes, or custom applications.

    It is the customer's responsibility to verify fitment before ordering.

    Berry Performance Sales is not responsible for fitment issues resulting from vehicle modifications, engine swaps, aftermarket components, or inaccurate information provided at checkout.

    If you have questions regarding compatibility, please contact us before placing your order.

    Race Use & Off-Road Products

    Some products sold by Berry Performance Sales are intended for race use, off-road use, or closed-course competition only and may not be legal for use on public roads.

    It is the customer's responsibility to verify local, state, and federal regulations before installing or using these products on a street-driven vehicle.

    Berry Performance Sales is not responsible for fines, citations, emissions violations, or other legal consequences resulting from the use of race-only or off-road-only parts.

    Return Packaging Requirements

    Do not write on, tape directly to, or affix shipping labels to the manufacturer's packaging.

    Returned items must be shipped in an outer box or protective packaging sufficient to prevent damage during transit.

    Items returned with damaged, altered, or missing packaging may be subject to additional deductions or denial of the return.

    Customers are responsible for ensuring return packages are properly packed and delivered to us. We strongly recommend using a trackable and insured shipping service.

    Fees to Know Upfront

    We believe in being transparent about costs:

    • Restocking Fee: 20% — deducted from all approved return refunds
    • Return Shipping: Buyer's responsibility on all standard returns
    • Cancellation (Installment/Payment Plan): 7% fee to cover transaction costs
    • Cancellation (Credit Card/PayPal): 3.5% processing fee
    • Cancellation (Backordered Parts): 3.5% fee, regardless of payment method, to cover processing costs already incurred

    Damaged, Defective, or Incorrect Items

    If your order arrives damaged, defective, or incorrect, you must contact us within 48 hours of delivery at sales@berryperformancesales.com.

    Claims reported outside this window may not be eligible for resolution.

    When contacting us, please include:

    • Your order number
    • A description of the issue
    • Clear photos or video of the damage or defect

    Do not install, modify, or use a damaged, defective, or incorrect item. Installation or use of such items constitutes acceptance of the product's condition and may void eligibility for return, replacement, or warranty consideration.

    Items confirmed to be defective due to a manufacturing defect or fulfillment error will have return shipping costs covered by Berry Performance Sales.

    Manufacturer warranties are separate from our return policy and may require inspection, troubleshooting, or approval directly through the manufacturer.

    Refunds

    Once we receive and inspect your return, refunds are processed within 3–5 business days back to your original payment method.

    Original shipping charges, expedited shipping fees, freight charges, customs fees, duties, taxes, brokerage fees, and other non-refundable service costs are not eligible for reimbursement unless the return is the result of a verified fulfillment error by Berry Performance Sales.

    Refunds are issued only to the original payment method used at checkout.

    You'll receive a confirmation email once your refund has been issued.

    Payment Disputes

    If you experience an issue with your order, we ask that you contact us directly before initiating a chargeback or payment dispute.

    Most concerns can be resolved quickly through our customer support team.

    Questions?

    We're happy to help before, during, or after your purchase.

    Email: sales@berryperformancesales.com

    Berry Performance Sales reserves the right to update this policy at any time. Changes take effect immediately upon posting. It is the customer's responsibility to review the current policy at the time of purchase.

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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