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Supplier details checked 2026-09-23 · Test catalog
Fits 1967-1974 Chevrolet Camaro, Pontiac Firebird with V8 engine. 2.50 inch Stainless Steel - Moderate sound
Flowmaster American Thunder Crossmember-Back Exhaust System
Includes Hangers and Hardware for Easy Installation
H-pipe Crossover for Maximum Power and Deep Tone
80 Series Cross-flow Performance Muffler
Mandrel-bent Stainless Steel Tubing
Moderate Exterior Exhaust Tone
Stainless Steel Construction
Lifetime Limited Warranty
Maximum Ground Clearance
Crossmember-Back System
Convertible models require 3/8-inch of shims on the factory X-brace for clearance of the exhaust tubing.
Flowmaster 67-74 Camaro/Nova 2.5in. American Thunder SS Crossmember-Back Exhaust System
6774 CAMARONOVA 25 AMT 409S
SYS 67-74 CAMARO/NOV
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.
SYS 67-74 CA
