Replacing your restrictive and likely corroded factory exhaust with a new cat-back exhaust is one of the best power adders that you can do to your C4 Corvette. The term “cat-back” refers to the section of the system that is downstream of the catalytic converter, a device that removes harmful emissions from exhaust gases.
An aftermarket exhaust with modern muffler technology will reduce backpressure, allowing more air to flow into the engine, which increases horsepower. According to the popular aftermarket exhaust manufacturer Corsa, a cat-back system for the L98 engine (the most common C4 engine) adds 14 horsepower and 16 foot-pounds of torque to an otherwise stock powerplant — all while adding a deep, muscular exhaust note that’ll make your C4 sound like a Corvette should.
Returning to catalytic converters for a moment, they’re typically long-lasting but may eventually fail by becoming contaminated, clogged, or overheated, leading to decreased horsepower. In the process of installing a cat-back exhaust, it’s worth inspecting or proactively replacing the catalytic converter itself. High-flow performance converters are available which will boost horsepower beyond the cat-back exhaust alone, yet still keep your vehicle compliant with the emissions guidelines of the EPA and local authorities.
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