86-91 Corvette 5.7L Cat Back Kit

The MagnaFlow 86-91 Corvette 5.7L Cat Back Kit (MPN 15658) is a complete exhaust system upgrade designed specifically for fourth-generation C4 Corvettes running the iconic 5.7L V8 engine. This cat-back exhaust kit delivers measurable improvements in engine tone and exhaust flow characteristics while maintaining street-legal compliance. The system features 2.5-inch diameter tubing constructed from durable stainless steel, ensuring corrosion resistance and longevity in varied climates.

The 3.5-inch polished stainless steel tips provide a refined appearance while optimizing exhaust scavenging for the naturally aspirated 5.7L powerplant. Installation involves replacing the factory exhaust from the catalytic converter rearward, preserving emissions compliance while freeing restricted airflow. The larger diameter piping reduces backpressure compared to stock systems, allowing the V8 to breathe more freely across the RPM range. MagnaFlow's Street Series positioning balances performance characteristics with everyday drivability—no extreme rasp or drone, but noticeable throttle response improvement.

This exhaust system is engineered for C4 Corvette owners seeking a factory-quality upgrade without extensive modifications. Whether restoring a late-1980s or early-1990s Corvette or simply modernizing the exhaust on an existing build, this cat-back kit integrates with original motor mounts and chassis geometry. Corvette enthusiasts appreciate the combination of improved engine sound, cleaner exhaust exit, and reliable stainless construction that resists salt-air corrosion and road debris.