To complete this installation you will need to MODIFY the Original Equipment (O.E.) Mid-Pipe by expanding the outlets from to 2.25" to 2.5". This system upgrades your '84-'91 Corvette from the stock 2.25" diameter Axle-Back system to a more aggressive 2.5". The system features the classic S-Type sound with no drone inside the vehicle. It has dual BORLA? intercooled style 3.38" x 3" rectangle polished T-304 stainless steel tips on each muffler for a custom appearance. BORLA? Cat-Back* & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA? Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium, high-quality T-304 austenitic stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA? stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.
S-Type Axle-Back Exhaust System 1984-1991 Chevrolet Corvette (C4) 5.7L V8 Automatic/ Manual Transmission Rear Wheel Drive Coupe/ Convertible. Converts The Stock 2.25" System To A More Aggressive 2.5" System.
Million Mile Warranty
1984-1991 Chevrolet Corvette (C4) 5.7L V8 Automatic/ Manual Transmission Rear Wheel Drive Coupe/ Convertible. Modification To Original Equipment Mid-Pipe REQUIRED.

Fitment:
1984 Chevrolet Corvette Base
1985 Chevrolet Corvette Base
1986 Chevrolet Corvette Base
1986 Chevrolet Corvette Indianapolis 500 Pace Car
1987 Chevrolet Corvette Base
1988 Chevrolet Corvette 35th Anniversary Edition
1988 Chevrolet Corvette Base
1989 Chevrolet Corvette Base
1990 Chevrolet Corvette Base
1990 Chevrolet Corvette ZR-1
1991 Chevrolet Corvette Base
1991 Chevrolet Corvette ZR-1