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Supplier details checked 2026-09-23 · Test catalog
Fits 1968-1972 GM A-Body with a V8 engine. 3.0 inch Stainless Steel - Aggressive sound
Flowmaster American Thunder Crossmember-Back Exhaust System
Does Not Include Header Reducers or Factory Manifold Downpipes
Super 40 Series Performance Mufflers for Deep Powerful Sound
H-pipe Crossover for Maximum Power and Deep Tone
Includes Hangers and Hardware for Installation
Mandrel-bent 16-gauge Stainless Steel Tubing
Crossmember-Back True Dual Exhaust System
Large 3.00-inch Stainless Steel Tubing
Aggressive Exterior Exhaust Tone
Lifetime Limited Warranty
System does not include header reducer cones or downpipes for factory manifolds
Flowmaster 68-72 GM A-BODY 3in. American Thunder SS Crossmember-Back Exhaust System
6872 GM ABODY 30 AMT 409S
SYS 68-72 GM A-BODY
This Crossmember-Back American Thunder system is custom designed for high horsepower and large cubic inch engines in 1968-1972 GM A-Bodies with a V8 engine. It's a true-dual exhaust system featuring all mandrel-bent 3.00-inch stainless steel tubing with a built-in H-pipe crossover assembly flowing into a pair of large cased Super 40 Series performance mufflers for maximum power and a deep powerful aggressive exhaust note. The large 3.00-inch mandrel-bent tailpipes are custom bent to tuck up high above the rear end and exit with a slight turn down under the rear bumper. The system is constructed from 409 stainless steel for maximum durability, includes all necessary hardware and hangers for installation and is covered by our Lifetime Limited Warranty. This system is also available in Aluminized steel and comes with a 3-year Limited Warranty, check out part# 17200.
SYS 68-72 GM
