Skip to Product Info
    • Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409
    • Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409
    • Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409
    • Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409
    • Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409
    • FLO817409.jpg
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster
    Sale!

    Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409

    Vendor: Flowmaster
    SKU: BDXN_817409
    Save $135
    Sale Price $1,075.95 Regular Price $1,210.95
    Free Shipping on Orders Over $99
    Professional, Enthusiast-Driven Customer Support
    International Shipping Available - Contact Us!
    Payment & Security

    Payments are processed through secure, encrypted systems. Your credit card details are never stored or accessible by us.

    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa

    This American Thunder exhaust system comes as a complete true dual Crossmember-Back exhaust for your 1968-1972 GM A-body with a V8 engine. These dual exhaust systems feature 2.50-inch mandrel-bent stainless steel tubing for maximum performance, includes a built-in H-pipe/balance tube flowing into a pair of large case Super 40 mufflers that deliver an aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard.

    The 2.50-inch tailpipes exit at a slight angle down under the rear bumper for a strong muscular look. The system includes all hangers and necessary hardware for installation. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage and is covered by our Lifetime Limited Warranty.

    • H-pipe Crossover for Maximum Power and Deep Tone
    • Super 40 Series Mufflers for Deep Powerful Sound
    • Mandrel-bent 16-gauge Stainless Steel Tubing
    • Includes Hangers and Hardware for Installation
    • Aggressive Exterior Exhaust Tone
    • Crossmember-Back True Dual Exhaust System
    • Does Not Include Header Reducers or Downpipes for Factory Manifolds
    • Lifetime Limited Warranty


    Flowmaster American Thunder Crossmember-Back Exhaust System Fits 1968-1972 GM A-Bodies With V8 Engine 2.50-Inch Stainless Steel Pipes Aggressive Sound Flowmaster 817409


    Specifications:

    Country of Origin USA
    Sold As Kit
    UPC 700042024056
    Availability Available
    Exhaust Type Crossmember Back
    Exit Style Dual Out Rear
    Mount Style Clamp-On
    Shape Oval


    This Part Fits:

    Year Make Model Submodel Notes
    1968 Chevrolet Chevelle 300
    1968 Pontiac LeMans
    1969 Pontiac LeMans
    1970 Pontiac LeMans
    1971 Pontiac LeMans
    1972 Pontiac LeMans
    1968 Chevrolet Chevelle Malibu
    1969 Chevrolet Chevelle Malibu
    1970 Chevrolet Chevelle Malibu
    1971 Chevrolet Chevelle Malibu
    1972 Chevrolet Chevelle Malibu
    1968 Chevrolet El Camino Custom
    1969 Chevrolet El Camino Custom
    1970 Chevrolet El Camino Custom
    1971 Chevrolet El Camino Custom
    1972 Chevrolet El Camino Custom
    1968 Buick Skylark Custom
    1969 Buick Skylark Custom
    1970 Buick Skylark Custom
    1971 Buick Skylark Custom
    1972 Buick Skylark Custom
    1968 Pontiac Tempest Custom
    1969 Pontiac Tempest Custom
    1968 Buick Sportwagon Custom
    1969 Buick Sportwagon Custom
    1968 Chevrolet Chevelle Nomad
    1969 Chevrolet Chevelle Nomad
    1970 Chevrolet Chevelle Nomad
    1971 Chevrolet Chevelle Nomad
    1972 Chevrolet Chevelle Nomad
    1968 Chevrolet Chevelle Concours
    1969 Chevrolet Chevelle Concours
    1970 Chevrolet Chevelle Concours
    1971 Chevrolet Chevelle Concours
    1972 Chevrolet Chevelle Concours
    1968 Chevrolet Chevelle 300 Deluxe
    1969 Chevrolet Chevelle 300 Deluxe
    1968 Oldsmobile Cutlass S
    1968 Pontiac Tempest Safari
    1969 Pontiac Tempest Safari
    1968 Oldsmobile Cutlass
    1969 Oldsmobile Cutlass
    1970 Oldsmobile Cutlass
    1971 Oldsmobile Cutlass
    1972 Oldsmobile Cutlass
    1968 Oldsmobile Cutlass Supreme
    1969 Oldsmobile Cutlass Supreme
    1970 Oldsmobile Cutlass Supreme
    1971 Oldsmobile Cutlass Supreme
    1972 Oldsmobile Cutlass Supreme
    1968 Buick Sportwagon
    1969 Buick Sportwagon
    1970 Buick Sportwagon
    1971 Buick Sportwagon
    1972 Buick Sportwagon
    1968 Buick GS 350
    1969 Buick GS 350
    1968 Pontiac GTO
    1969 Pontiac GTO
    1970 Pontiac GTO
    1971 Pontiac GTO
    1972 Pontiac GTO
    1968 Oldsmobile 442
    1969 Oldsmobile 442
    1970 Oldsmobile 442
    1971 Oldsmobile 442
    1968 Chevrolet Chevelle
    1968 Pontiac Grand Prix
    1969 Pontiac Grand Prix
    1970 Pontiac Grand Prix
    1971 Pontiac Grand Prix
    1972 Pontiac Grand Prix
    1968 Oldsmobile Vista Cruiser
    1969 Oldsmobile Vista Cruiser
    1970 Oldsmobile Vista Cruiser
    1971 Oldsmobile Vista Cruiser
    1972 Oldsmobile Vista Cruiser
    1968 Chevrolet Chevelle SS
    1969 Chevrolet Chevelle SS
    1970 Chevrolet Chevelle SS
    1971 Chevrolet Chevelle SS
    1972 Chevrolet Chevelle SS
    1968 Pontiac Tempest
    1969 Pontiac Tempest
    1970 Pontiac Tempest
    1968 Buick Special
    1969 Buick Special
    1968 Buick GS 400
    1969 Buick GS 400
    1968 Chevrolet El Camino SS
    1969 Chevrolet El Camino SS
    1970 Chevrolet El Camino SS
    1971 Chevrolet El Camino SS
    1972 Chevrolet El Camino SS
    1968 Oldsmobile F85
    1969 Oldsmobile F85
    1970 Oldsmobile F85
    1971 Oldsmobile F85
    1972 Oldsmobile F85
    1968 Chevrolet El Camino
    1969 Chevrolet El Camino
    1970 Chevrolet El Camino
    1971 Chevrolet El Camino
    1972 Chevrolet El Camino
    1968 Buick Skylark
    1969 Buick Skylark
    1970 Buick Skylark
    1971 Buick Skylark
    1972 Buick Skylark
    1969 Chevrolet Chevelle Greenbrier
    1970 Chevrolet Chevelle Greenbrier
    1971 Chevrolet Chevelle Greenbrier
    1972 Chevrolet Chevelle Greenbrier
    1969 Chevrolet Chevelle Concours Estate
    1970 Chevrolet Chevelle Concours Estate
    1971 Chevrolet Chevelle Concours Estate
    1972 Chevrolet Chevelle Concours Estate
    1969 Pontiac LeMans Safari
    1970 Pontiac LeMans Safari
    1970 Pontiac Tempest GT
    1970 Pontiac LeMans Sport
    1971 Pontiac LeMans Sport
    1972 Pontiac LeMans Sport
    1970 Pontiac GTO The Judge
    1971 Pontiac GTO The Judge
    1970 Buick GS 455 GSX
    1970 Buick GS
    1971 Buick GS
    1972 Buick GS
    1970 Buick GS 455
    1971 Buick GS 455
    1972 Buick GS 455
    1970 Chevrolet Monte Carlo
    1971 Chevrolet Monte Carlo
    1972 Chevrolet Monte Carlo
    1970 Chevrolet Chevelle
    1971 Chevrolet Chevelle
    1972 Chevrolet Chevelle
    1970 Buick Skylark 350
    1971 Oldsmobile Cutlass S
    1972 Oldsmobile Cutlass S
    1971 Pontiac LeMans T37
    1971 GMC Sprint
    1972 GMC Sprint
    1972 Pontiac LeMans Luxury
    1972 GMC Sprint Custom
    1972 Oldsmobile Cutlass Cruiser
    1972 Buick Skylark 350
    Shipping Policy

    Cancellations

    Once an order is placed, in most cases it cannot be cancelled as they are sent for fulfillment almost immediately after receiving the order. If there is an ability to cancel the order, the buyer is responsible for the transaction fees charged from the transaction.

    Processing Time

    In-stock orders are typically processed and shipped within 1–2 business days of receiving payment, unless otherwise stated on the product page. Orders placed on weekends or holidays will be processed on the next business day.

    Shipping Costs

    Shipping costs are calculated based on the shipping method selected, the weight and dimensions of the package, and the destination address. You can view the shipping costs for your order during the checkout process before finalizing your purchase.

    Tracking Information

    Once your order has been shipped, you will receive a shipping confirmation email with tracking information. You can use this information to track the status of your package and monitor its delivery progress.

    Delivery Time

    While we make every effort to ensure timely delivery, please note that delivery times may vary due to factors beyond our control, such as weather conditions or carrier delays.

    International Shipping

    For international orders, please be aware that customs duties, taxes, and other fees may apply upon delivery. These additional charges are the responsibility of the recipient and are not included in the shipping cost paid at checkout. Please check with your local customs office for information on potential fees before placing your order.

    Shipping Address

    Please ensure that the shipping address provided during checkout is accurate and complete. We are not responsible for orders shipped to incorrect or undeliverable addresses due to customer error.

    Return Policy

    Return Period

    You have up to 30 days from the date of purchase to return eligible items.

    Condition of the Item

    A 20% restocking fee will apply to cover inspection, processing, and repackaging costs.

    Items must be returned in new, unused condition and include all original packaging, hardware, and documentation.

    Return Shipping

    The cost of return shipping is the responsibility of the buyer unless the item was received damaged, defective, or incorrect.

    Return Authorization

    Before returning any item, please contact our customer service team to obtain a Return Merchandise Authorization (RMA) number. Items returned without an RMA may not be accepted.

    Refund Processing

    Once the returned item is received and inspected, we will initiate the refund process. Please allow 2–5 days for the refund to be processed and credited to the original payment method. Bank processing times may vary.

    Damaged or Defective Items

    If you receive a damaged, defective, or incorrect item, contact us immediately for assistance. We’ll work quickly to resolve the issue or send a replacement.

    Final Sale Items

    Certain items may be marked as Final Sale and are not eligible for return or exchange. These will be clearly noted on the product page.

    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.

    Recently Viewed