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American Thunder Crossmember-Back Exhaust System

Flowmaster American Thunder Crossmember-Back Exhaust System

Mfg Part #
817409
NP#
FLO817409
Brand
Flowmaster
Fitment Note
Aggressive sound; Super 40 Series Performance Mufflers; 2.50-inch Stainless Steel Pipes; Small Block Chevy Swap; Big Block Chevy Swap; LS Swap; LT Swap.

Fits 1968 to 1972 Buick GS, GS 350, GS 400 and 4 more models; 1968 to 1972 Chevrolet Chevelle, El Camino, Monte Carlo; 1971 to 1972 GMC Sprint; 2 more makes. See every vehicle

  • 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
$1,565.13 CAD Ships Sep 22
Free shipping in Canada, ships Sep 22
Availability: This product is in one of our warehouses.
Book installation at our Service Centre

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Description

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.

Warranty: Manufacturer's Limited Lifetime Warranty

Fits these vehicles

YearMakeModelSubmodelEngine
1970 - 1972BuickGSBase5.7L 350 V8
1968 - 1969BuickGS 350Base5.7L 350 V8
1968 - 1969BuickGS 400Base6.6L 400 V8
1970BuickGS 455Base, GSX7.5L 455 V8
1971 - 1972BuickGS 455Base7.5L 455 V8
1968BuickSkylarkBase, Custom5.7L 350 V8, 6.6L 400 V8
1969BuickSkylarkBase, Custom5.7L 350 V8
1970BuickSkylark350, Base, Custom5.7L 350 V8, 7.5L 455 V8
1971BuickSkylarkBase, Custom5.7L 350 V8, 7.5L 455 V8
1972BuickSkylark350, Base, Custom5.7L 350 V8
1968 - 1969BuickSpecialBase5.7L 350 V8
1968 - 1969BuickSportwagonBase, Custom5.7L 350 V8, 6.6L 400 V8
1970BuickSportwagonBase5.7L 350 V8, 7.5L 455 V8
1971 - 1972BuickSportwagonBase5.7L 350 V8
1968ChevroletChevelle300, 300 Deluxe, Concours, Malibu, Nomad, Nomad Custom, SS 3965.0L 307 V8, 5.3L 327 V8, 6.5L 396 V8
1969ChevroletChevelle300 Deluxe, Concours, Concours Estate, Greenbrier, Malibu, Nomad, SS 3965.0L 307 V8, 5.7L 350 V8, 6.5L 396 V8
1970ChevroletChevelleBase, Concours, Concours Estate, Greenbrier, Malibu, Nomad, SS 396, SS 4545.0L 307 V8, 5.7L 350 V8, 6.6L 402 V8, 7.4L 454 V8
1971 - 1972ChevroletChevelleBase, Concours, Concours Estate, Greenbrier, Heavy Chevy, Malibu, Nomad, SS5.0L 307 V8, 5.7L 350 V8, 6.6L 402 V8, 7.4L 454 V8
1968ChevroletEl CaminoBase, Custom, SS5.0L 307 V8, 5.3L 327 V8, 5.4L 327 V8, 5.7L 350 V8, 6.5L 396 V8
1969ChevroletEl CaminoBase, Custom, SS5.0L 307 V8, 5.3L 327 V8, 5.7L 350 V8, 6.5L 396 V8
1970ChevroletEl CaminoBase, Custom, SS5.0L 307 V8, 5.7L 350 V8, 6.5L 396 V8, 6.6L 400 V8, 6.6L 402 V8, 7.4L 454 V8
1971 - 1972ChevroletEl CaminoBase, Custom, SS5.0L 307 V8, 5.7L 350 V8, 6.6L 400 V8, 6.6L 402 V8, 7.4L 454 V8
1970 - 1972ChevroletMonte CarloBase5.7L 350 V8, 6.6L 400 V8, 6.6L 402 V8, 7.4L 454 V8
1971GMCSprintBase5.0L 307 V8, 5.7L 350 V8, 6.6L 400 V8, 6.6L 402 V8, 7.4L 454 V8
1972GMCSprintBase, Custom5.0L 307 V8, 5.7L 350 V8, 6.6L 400 V8, 6.6L 402 V8, 7.4L 454 V8
1968 - 1969Oldsmobile442Base6.6L 400 V8, 7.5L 455 V8
1970 - 1971Oldsmobile442Base7.5L 455 V8
1968OldsmobileCutlassBase, S5.7L 350 V8, 6.6L 400 V8
1969OldsmobileCutlassBase5.7L 350 V8
1970OldsmobileCutlassBase5.7L 350 V8, 7.5L 455 V8
1971OldsmobileCutlassBase, S5.7L 350 V8, 7.5L 455 V8
1972OldsmobileCutlassBase, Cruiser, S5.7L 350 V8, 7.5L 455 V8
1968 - 1970OldsmobileCutlass SupremeBase5.7L 350 V8
1971 - 1972OldsmobileCutlass SupremeBase5.7L 350 V8, 7.5L 455 V8
1968 - 1969OldsmobileF85Base5.7L 350 V8
1970OldsmobileF85Base5.7L 350 V8, 7.5L 455 V8
1971OldsmobileF85Base5.7L 350 V8
1972OldsmobileF85Base5.7L 350 V8, 7.5L 455 V8
1968 - 1969OldsmobileVista CruiserBase5.7L 350 V8, 6.6L 400 V8
1970 - 1972OldsmobileVista CruiserBase5.7L 350 V8, 7.5L 455 V8
1968PontiacBeaumontBase5.0L 307 V8, 5.3L 327 V8, 5.7L 350 V8, 6.5L 396 V8
1969PontiacBeaumontBase5.0L 307 V8, 5.7L 350 V8, 6.5L 396 V8
1969PontiacGrand PrixBase6.6L 400 V8, 7.0L 428 V8
1970 - 1972PontiacGrand PrixBase6.6L 400 V8, 7.5L 455 V8
1968 - 1969PontiacGTOBase6.6L 400 V8
1970 - 1971PontiacGTOBase, The Judge6.6L 400 V8, 7.5L 455 V8
1972PontiacGTOBase6.6L 400 V8, 7.5L 455 V8
1968PontiacLeMansBase5.7L 350 V8, 6.6L 400 V8
1969PontiacLeMansBase, Safari5.7L 350 V8, 6.6L 400 V8
1970PontiacLeMansBase, Safari, Sport5.7L 350 V8, 6.6L 400 V8, 7.5L 455 V8
1971PontiacLeMansBase, Sport, T375.7L 350 V8, 6.6L 400 V8, 7.5L 455 V8
1972PontiacLeMansBase, Luxury, Sport5.7L 350 V8, 6.6L 400 V8, 7.5L 455 V8
1968 - 1969PontiacTempestBase, Custom, Safari5.7L 350 V8, 6.6L 400 V8
1970PontiacTempestBase, GT5.7L 350 V8, 6.6L 400 V8

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