Part #: S4801304. This MBRP® Axle - Back Performance Exhaust is designed for Subaru WRX 2.0L and Subaru WRX STI 2.5L models. It features 2.5 - inch axle - back design, dual split rear exit, T304 stainless steel construction, and single - wall T304 polished exhaust tips. The exhaust enhances the sound and tone of the Boxer engine. Made from T304 stainless steel in the PRO Series, it has 2.5 - inch mandrel - bent tubing with a unique routing design. The all - new Axle - Back exhaust system by MBRP® showcases the high - performance of the Subaru Boxer engine. Its T304 stainless steel quality matches the performance improvement, making your WRX or WRX STI more exciting to drive. The single - wall T304 exhaust tip option with continuous flow gives it a solid design. The engineering and design instantly elevate the car's sound. The 3 - inch mandrel - bent tubing, unique muffler, and distinct routing make it a top upgrade for Subaru enthusiasts. With a Lifetime Warranty, it's a great investment.

Using the MBRP Axle Back Exhaust is straightforward. Just follow the included installation guide to attach it to your 2015 - 2021 Subaru WRX or WRX STI. Make sure all the connections are tight. When driving, you'll immediately notice the enhanced sound of your Boxer engine. As for maintenance, regularly check the exhaust for any signs of damage or loose parts. Clean the T304 stainless steel and polished tips with a mild automotive cleaner to keep them looking great. Avoid using harsh chemicals as they may damage the finish. If you encounter any issues, refer to the warranty details or contact our customer service.