Catback Exhaust Straight for Chevrolet Camaro Pontiac Firebird (1993-1997) 5.7LHigh Flow Mandrel Bent Catback Exhaust for 1993 1997 Chevrolet, Pontiac Camaro, Firebird (LT1 F Body) What it Does: Replaces the restrictive factory 2. 75 inch exhaust and Y pipe with a 3 inch high velocity stainless steel system to maximize exhaust scavenging and increase horsepower on 5. 7L LT1 engines. The Stock F Body Exhaust Restriction The factory exhaust system on the 1993 1997 GM F Body is a notorious bottleneck for the LT1 engine. Utilizing