The GReddy Supreme SP exhaust system for the 9th generation (FB) Civic Si carries the quintessential GReddy aesthetics and acoustic signature, now with an updated piping diameter for optimized performance. Crafted to pair seamlessly with both the coupe and sedan models (with the use of an optional adapter), its design incorporates a straight-through resonator and a distinctive oval muffler with an extended, offset tip. This meticulous design conforms to the vehicle's contours, effectively diminishing drone and high-pitched sounds, while delivering consistent power enhancements across the rev range. True to GReddy's legacy, this complete 304 Stainless-Steel, hand-welded exhaust is backed by a Limited Lifetime Warranty.

Perfect for the 2012-2015 Honda Civic Si 2dr, and adaptable to the 4dr with an additional adapter, this cat-back system comes in 3 pieces with 63.5 mm diameter piping and sports a 105 mm tip. GReddy ensures a secure installation with 2 included gaskets and incorporates a resonator for sound precision. Despite its substantial presence, the system maintains a light weight of 28.0 lbs, outclassing the stock system, and upholds a refined sound level of 94.0 dB(a), all while boosting horsepower and torque.