HKS has developed this awesome quality crafted exhaust for your 2002 Subaru WRX. The canister is wrapped in Carbon Fiber for a ultra cool look and giving the exhaust an extremely light weight. The 4 inch tip is constructed of extremely durable and lightweight titanium. The titanium will not corrode from anything it would experience as an exhaust. This is a cat-back system only and bolts directly on with no problem. Great sound, nice look, and good price. And yes it produces power!