This HKS Sport Cat Back Exhaust is specifically designed for 2002 - 2007 Subaru WRX and 2004 - 2007 Subaru STI models. It offers a range of great benefits. First, it boosts horsepower and torque by allowing exhaust gases to flow out freely, reducing turbo lag. Made from 409 mild steel, it has a polished 106mm (4.17in) exhaust tip and 75mm (2.95in) piping. The exhaust hangers are welded at OEM locations for easy direct fitment and installation. It comes with all new hardware and gaskets. This exhaust is ideal for daily drivers who don't want a too - loud setup. Constructed of ceramic - coated mild steel 75mm piping with a 106mm tip, it adds performance and a stealthy look without attracting unwanted attention like many aftermarket systems. Note: If you're using a stock j pipe or downpipe, the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046 is required.


Using this HKS Sport Cat Back Exhaust is straightforward. First, make sure you have all the necessary tools handy. Check if you're using a stock j pipe or downpipe, and if so, get the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046. The exhaust hangers are already welded at the OEM locations, so it should fit directly onto your vehicle. Just use the included hardware and gaskets for installation. As for maintenance, keep an eye on the exhaust tip and the piping. Wipe them down regularly to prevent dirt and grime build - up. If you notice any signs of rust, especially on the mild steel parts, clean it off and apply a protective coating. Also, check the hardware and gaskets periodically to ensure they're in good condition and tight. This will help keep your exhaust system performing at its best and looking great for a long time.