The Revolution RS for the Infiniti G37S has an aggressive growl while saving about half the weight over the stock system. The light-weight cat-back connects both engine banks through dual 2.5" (63.5mm) piping that merge smoothly into 3" (76mm) piping and a large resonator on the mid-pipe. The system exits an extra long, high-flow, RS muffler on the driver-side to manage sound output and avoid having to relocate the EVAP system. Dyno test have shown 11whp / 16ft-lbs gain on a normally-aspirated VQ37HR engine. Like all GReddy Revolution RS systems, it is a fully hand-welded 304 Stainless-Steel exhaust, that carries a Limited Lifetime Warranty.