This HKS Hi - Power Cat Back Exhaust is a top - notch upgrade for your 2015 - 2021 Subaru WRX or STI. It offers more power, better performance, and a significant improvement in low - end torque. The exhaust produces an aggressive and loud note that any car enthusiast will love. It enhances exhaust flow, reducing turbo lag and getting your engine running more smoothly. Made from 304 stainless steel, it's durable and built to last. With a 3 - inch piping diameter and a 3.8 - inch tip diameter, it has a great look. The sound level is 90dB. The stock system weighs 46 pounds, while this HKS exhaust weighs only 33 pounds, making it lighter. The exhaust hangers are welded onto the OEM location for a direct replacement. It comes with new hardware and O - ring gaskets. HKS designed this exhaust to have a free - flowing design with great sound. The built - in resonance pipe eliminates low exhaust resonance, letting you enjoy the classic boxer sound. 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 exhaust is straightforward. It's designed to fit directly onto your 2015 - 2021 Subaru WRX or STI at the OEM location. Just replace your old exhaust system with this new one using the included hardware and O - ring gaskets. Make sure to check the fitment carefully during installation. If you have a stock j pipe or downpipe, don't forget to get the GrimmSpeed adapter. As for maintenance, keep it clean by washing it regularly with mild soap and water. This will help prevent rust and keep it looking good. Periodically check the exhaust hangers and hardware to make sure they're tight. If you notice any unusual noises or performance issues, have it inspected by a professional.
