Greddy Revolution RS Exhaust 2002-2007 Subaru WRX/STIThe Revolution RS for the GDB 2002 2007 Subaru WRX STI features a full non tapered 76mm (3) diameter piping. The focused layout of the cat back exhaust uses minimal bends to produces a cost effective, light weight system that saves 8lbs over the stock system. Traditional GReddy RS styling positions a large resonator and the muffler and tip fashionably underneath the vehicle, while enhancing the profile body lines perfectly. Dyno test have shown