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    • Flowmaster Flowmaster American Thunder Crossmember-Back Exhaust System 817104
    • Flowmaster Flowmaster American Thunder Crossmember-Back Exhaust System 817104
    • Flowmaster Flowmaster American Thunder Crossmember-Back Exhaust System 817104
    • American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird With V8 Engine 2.50 Inch Stainless Steel Moderate Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird With V8 Engine 2.50 Inch Stainless Steel Moderate Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird With V8 Engine 2.50 Inch Stainless Steel Moderate Sound Flowmaster
    • American Thunder Crossmember-Back Exhaust System Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird With V8 Engine 2.50 Inch Stainless Steel Moderate Sound Flowmaster
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    Sale!

    Flowmaster Flowmaster American Thunder Crossmember-Back Exhaust System 817104

    Vendor: Flowmaster
    Part Number: 817104
    Save $157
    Sale Price $1,249.95 Regular Price $1,406.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    Flowmaster® is proud to introduce our American Thunder® dual exhaust system for 1967-1974 Chevrolet Camaro, Pontiac Firebird and 1968-1974 Chevrolet Nova's. This all stainless steel exhaust system features our exclusive design 80 Series™ Crossflow muffler, all mandrel-bent dual 2.50-inch pipes including an H-pipe crossover for a deep smooth tone that also minimizes any back-rap on deceleration. The dual 2.50-inch stainless steel tailpipes provide a deep rich sound and optimum performance. This Crossmember-Back 409S stainless system gives these classic muscle cars a moderate tone inside and out. Using the crossflow design, this exhaust places the muffler in the factory location behind the rear axle retaining full ground clearance under the car while offering all the performance benefits of a full dual exhaust system. The system includes all parts, hardware and illustrated instructions, and like all Flowmaster stainless steel street products, it includes our Limited Lifetime Warranty.


    Flowmaster Flowmaster American Thunder Crossmember-Back Exhaust System 817104


    Specifications:

    Brand Flowmaster
    California Proposition 65 Yes
    California Proposition 65 Chemical Name Chromium (hexavalent compounds)
    California Proposition 65 Chemical Name Nickel (Metallic)
    CARB (California) Compliant Yes
    Catalytic Converter Included No
    2874 0
    Category Exhaust
    3728 Flat Band
    1882 Yes
    Emission Code 5
    Exhaust Series American Thunder
    Exhaust Tip Quantity Sold Separately
    1161 0
    10980 Round
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    Heat Shield Included No
    Inlet Diameter 2.50
    596 Weld-On
    9871 2.50
    92 Yes
    11039 4.00
    11040 22.25
    11041 9.50
    11076 Black High-Temperature Paint Finish
    11070 Chambered
    9884 4.00
    1892 22.25
    4372 409 Stainless Steel
    4373 Oval
    9882 Black High-Temperature Paint Finish
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 2.50
    4366 2.63
    9963 Slip-Fit
    4375 1
    Muffler Part Number Kit Only
    4374 1
    Muffler Series 80 Series Crossflow
    1174 Chambered
    part type Exhaust System
    3530 409 Stainless Steel
    Product Type Exhaust System
    Sound Level Moderate
    4377 No
    Sub Category Exhaust and Tail Pipes
    4369 2.50
    4376 2
    Tail Pipe Quantity Dual
    4370 No
    Type Crossmember-back
    6014 No
    2126 Not Applicable
    Warning California Proposition 65
    Pipe Color Silver
    Pipe Color Black
    Drive 2WD
    9885 9.50
    Brand Flowmaster
    California Proposition 65 Yes
    California Proposition 65 Chemical Name Chromium (hexavalent compounds)
    California Proposition 65 Chemical Name Nickel (Metallic)
    CARB (California) Compliant Yes
    Catalytic Converter Included No
    2874 0
    Category Exhaust
    3728 Flat Band
    1882 Yes
    Emission Code 5
    Exhaust Series American Thunder
    Exhaust Tip Quantity Sold Separately
    1161 0
    10980 Round
    9870 Dual Out Rear
    200 Natural
    353 No
    3390 Performance
    4364 Yes
    Heat Shield Included No
    Inlet Diameter 2.50
    596 Weld-On
    9871 2.50
    92 Yes
    11039 4.00
    11040 22.25
    11041 9.50
    11076 Black High-Temperature Paint Finish
    11070 Chambered
    9884 4.00
    1892 22.25
    4372 409 Stainless Steel
    4373 Oval
    9882 Black High-Temperature Paint Finish
    4367 No
    4368 No
    Muffler Included Yes
    9962 Slip-Fit
    4365 2.50
    4366 2.63
    9963 Slip-Fit
    4375 1
    Muffler Part Number Kit Only
    4374 1
    Muffler Series 80 Series Crossflow
    1174 Chambered
    part type Exhaust System
    3530 409 Stainless Steel
    Product Type Exhaust System
    Sound Level Moderate
    4377 No
    Sub Category Exhaust and Tail Pipes
    4369 2.50
    4376 2
    Tail Pipe Quantity Dual
    4370 No
    Type Crossmember-back
    6014 No
    2126 Not Applicable
    Warning California Proposition 65
    Pipe Color Silver
    Pipe Color Black
    Drive 2WD
    9885 9.50
    Description_ABR SYS 67-74 CA
    Description_SHO SYS 67-74 CAMARO/NOV
    Description_INV 67-74 CAMARO/NOVA 2.5" AMT 409S
    Description_ASC Convertible models require 3/8-inch of shims on the factory X-brace for clearance of the exhaust tubing.
    Description_DES Flowmaster American Thunder Crossmember-Back Exhaust System
    Description_EXT Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird with V8 engine. 2.50 inch Stainless Steel - Moderate sound
    Description_MKT Flowmaster® is proud to introduce our American Thunder® dual exhaust system for 1967-1974 Chevrolet Camaro, Pontiac Firebird and 1968-1974 Chevrolet Nova's. This all stainless steel exhaust system features our exclusive design 80 Series™ Crossflow muffler, all mandrel-bent dual 2.50-inch pipes including an H-pipe crossover for a deep smooth tone that also minimizes any back-rap on deceleration. The dual 2.50-inch stainless steel tailpipes provide a deep rich sound and optimum performance. This Crossmember-Back 409S stainless system gives these classic muscle cars a moderate tone inside and out. Using the crossflow design, this exhaust places the muffler in the factory location behind the rear axle retaining full ground clearance under the car while offering all the performance benefits of a full dual exhaust system. The system includes all parts, hardware and illustrated instructions, and like all Flowmaster stainless steel street products, it includes our Limited Lifetime Warranty.
    Description_FAB H-pipe Crossover for Maximum Power and Deep Tone
    Description_FAB Includes Hangers and Hardware for Easy Installation
    Description_FAB 80 Series Cross-flow Performance Muffler
    Description_FAB Mandrel-bent Stainless Steel Tubing
    Description_FAB Moderate Exterior Exhaust Tone
    Description_FAB Maximum Ground Clearance
    Description_FAB Stainless Steel Construction
    Description_FAB Lifetime Limited Warranty
    Description_FAB Crossmember-Back System
    Description_ABR SYS 67-74 CA
    Description_SHO SYS 67-74 CAMARO/NOV
    Description_INV 67-74 CAMARO/NOVA 2.5" AMT 409S
    Description_ASC Convertible models require 3/8-inch of shims on the factory X-brace for clearance of the exhaust tubing.
    Description_DES Flowmaster American Thunder Crossmember-Back Exhaust System
    Description_EXT Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird with V8 engine. 2.50 inch Stainless Steel - Moderate sound
    Description_MKT Flowmaster® is proud to introduce our American Thunder® dual exhaust system for 1967-1974 Chevrolet Camaro, Pontiac Firebird and 1968-1974 Chevrolet Nova's. This all stainless steel exhaust system features our exclusive design 80 Series™ Crossflow muffler, all mandrel-bent dual 2.50-inch pipes including an H-pipe crossover for a deep smooth tone that also minimizes any back-rap on deceleration. The dual 2.50-inch stainless steel tailpipes provide a deep rich sound and optimum performance. This Crossmember-Back 409S stainless system gives these classic muscle cars a moderate tone inside and out. Using the crossflow design, this exhaust places the muffler in the factory location behind the rear axle retaining full ground clearance under the car while offering all the performance benefits of a full dual exhaust system. The system includes all parts, hardware and illustrated instructions, and like all Flowmaster stainless steel street products, it includes our Limited Lifetime Warranty.
    Description_FAB H-pipe Crossover for Maximum Power and Deep Tone
    Description_FAB Includes Hangers and Hardware for Easy Installation
    Description_FAB 80 Series Cross-flow Performance Muffler
    Description_FAB Mandrel-bent Stainless Steel Tubing
    Description_FAB Moderate Exterior Exhaust Tone
    Description_FAB Maximum Ground Clearance
    Description_FAB Stainless Steel Construction
    Description_FAB Lifetime Limited Warranty
    Description_FAB Crossmember-Back System


    This Part Fits:

    Year Make Model Submodel Notes
    1967 Chevrolet Camaro Base
    1967 Chevrolet Camaro Base
    1968 Chevrolet Camaro Base
    1968 Chevrolet Camaro Base
    1969 Chevrolet Camaro Base
    1969 Chevrolet Camaro Base
    1969 Chevrolet Camaro Base
    1969 Chevrolet Camaro Base
    1969 Chevrolet Camaro Base
    1970 Chevrolet Camaro Base
    1970 Chevrolet Camaro Base
    1971 Chevrolet Camaro Base
    1971 Chevrolet Camaro Base
    1971 Chevrolet Camaro Base
    1972 Chevrolet Camaro Base
    1972 Chevrolet Camaro Base
    1972 Chevrolet Camaro Base
    1973 Chevrolet Camaro Base
    1973 Chevrolet Camaro Base
    1974 Chevrolet Camaro Base
    1973 Chevrolet Camaro LT
    1973 Chevrolet Camaro LT
    1974 Chevrolet Camaro LT
    1967 Chevrolet Camaro RS
    1967 Chevrolet Camaro RS
    1967 Chevrolet Camaro RS
    1968 Chevrolet Camaro RS
    1968 Chevrolet Camaro RS
    1969 Chevrolet Camaro RS
    1969 Chevrolet Camaro RS
    1969 Chevrolet Camaro RS
    1969 Chevrolet Camaro RS
    1969 Chevrolet Camaro RS
    1970 Chevrolet Camaro RS
    1970 Chevrolet Camaro RS
    1971 Chevrolet Camaro RS
    1971 Chevrolet Camaro RS
    1972 Chevrolet Camaro RS
    1972 Chevrolet Camaro RS
    1973 Chevrolet Camaro RS
    1973 Chevrolet Camaro RS
    1967 Chevrolet Camaro SS
    1967 Chevrolet Camaro SS
    1968 Chevrolet Camaro SS
    1968 Chevrolet Camaro SS
    1969 Chevrolet Camaro SS
    1969 Chevrolet Camaro SS
    1970 Chevrolet Camaro SS
    1970 Chevrolet Camaro SS
    1971 Chevrolet Camaro SS
    1971 Chevrolet Camaro SS
    1972 Chevrolet Camaro SS
    1972 Chevrolet Camaro SS
    1967 Chevrolet Camaro Z28
    1968 Chevrolet Camaro Z28
    1969 Chevrolet Camaro Z28
    1970 Chevrolet Camaro Z28
    1971 Chevrolet Camaro Z28
    1972 Chevrolet Camaro Z28
    1972 Chevrolet Camaro Z28
    1973 Chevrolet Camaro Z28
    1974 Chevrolet Camaro Z28
    1968 Chevrolet Chevy II Nova
    1969 Chevrolet Nova Base
    1969 Chevrolet Nova Base
    1969 Chevrolet Nova Base
    1970 Chevrolet Nova Base
    1970 Chevrolet Nova Base
    1970 Chevrolet Nova Base
    1970 Chevrolet Nova Base
    1970 Chevrolet Nova Base
    1971 Chevrolet Nova Base
    1971 Chevrolet Nova Base
    1971 Chevrolet Nova Base
    1971 Chevrolet Nova Base
    1972 Chevrolet Nova Base
    1972 Chevrolet Nova Base
    1972 Chevrolet Nova Base
    1973 Chevrolet Nova Base
    1973 Chevrolet Nova Base
    1974 Chevrolet Nova Base
    1973 Chevrolet Nova Custom
    1973 Chevrolet Nova Custom
    1974 Chevrolet Nova Custom
    1967 Pontiac Firebird 326
    1968 Pontiac Firebird 350
    1969 Pontiac Firebird 350
    1969 Pontiac Firebird 350 HO
    1967 Pontiac Firebird 400
    1968 Pontiac Firebird 400
    1969 Pontiac Firebird 400
    1967 Pontiac Firebird Base
    1967 Pontiac Firebird Base
    1968 Pontiac Firebird Base
    1968 Pontiac Firebird Base
    1969 Pontiac Firebird Base
    1969 Pontiac Firebird Base
    1970 Pontiac Firebird Base
    1970 Pontiac Firebird Base
    1971 Pontiac Firebird Base
    1971 Pontiac Firebird Base
    1971 Pontiac Firebird Base
    1972 Pontiac Firebird Base
    1972 Pontiac Firebird Base
    1972 Pontiac Firebird Base
    1973 Pontiac Firebird Base
    1973 Pontiac Firebird Base
    1973 Pontiac Firebird Base
    1974 Pontiac Firebird Base
    1974 Pontiac Firebird Base
    1974 Pontiac Firebird Base
    1970 Pontiac Firebird Esprit
    1970 Pontiac Firebird Esprit
    1971 Pontiac Firebird Esprit
    1971 Pontiac Firebird Esprit
    1971 Pontiac Firebird Esprit
    1972 Pontiac Firebird Esprit
    1972 Pontiac Firebird Esprit
    1972 Pontiac Firebird Esprit
    1973 Pontiac Firebird Esprit
    1973 Pontiac Firebird Esprit
    1973 Pontiac Firebird Esprit
    1974 Pontiac Firebird Esprit
    1974 Pontiac Firebird Esprit
    1974 Pontiac Firebird Esprit
    1970 Pontiac Firebird Formula
    1970 Pontiac Firebird Formula
    1971 Pontiac Firebird Formula
    1971 Pontiac Firebird Formula
    1971 Pontiac Firebird Formula
    1972 Pontiac Firebird Formula
    1972 Pontiac Firebird Formula
    1972 Pontiac Firebird Formula
    1973 Pontiac Firebird Formula
    1973 Pontiac Firebird Formula
    1973 Pontiac Firebird Formula
    1974 Pontiac Firebird Formula
    1974 Pontiac Firebird Formula
    1974 Pontiac Firebird Formula
    1967 Pontiac Firebird HO
    1967 Pontiac Firebird HO
    1968 Pontiac Firebird HO
    1969 Pontiac Firebird Trans Am
    1970 Pontiac Firebird Trans Am
    1970 Pontiac Firebird Trans Am
    1971 Pontiac Firebird Trans Am
    1971 Pontiac Firebird Trans Am
    1972 Pontiac Firebird Trans Am
    1972 Pontiac Firebird Trans Am
    1973 Pontiac Firebird Trans Am
    1973 Pontiac Firebird Trans Am
    1974 Pontiac Firebird Trans Am
    1974 Pontiac Firebird Trans Am
    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    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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