Fitment: This exhaust fits 2015 - 2021 Subaru STI and WRX models. Note that it only works with the Standard OEM Midpipe or REMARK Midpipe kit and doesn't fit aftermarket exhaust systems. Features: The Remark Boso Edition axle back exhaust offers a 'Bosozuku' - inspired style and a loud, aggressive Subie sound. It's crafted from high - quality 304 stainless steel with hand - crafted tig welding. It saves weight and boosts power, torque, and sound. Key features include a muffler delete straight pipe design, easy direct bolt - on installation to the OEM or Remark mid Y - pipe, mandrel bent piping, factory OEM style exhaust hanger rod construction, and it comes with gaskets and bolts. It also reduces weight compared to factory mufflers. Specs: Made of T304 Stainless Steel, with a 2.5 - inch 16 - gauge piping diameter. It has ultra - aggressive quad slant style 3.5 - inch single - wall stainless steel tips. Pair it with a Remark mid pipe for a complete cat - back exhaust. Difference between SPT and Standard: Standard axleback exhausts have rounded rhombus - shaped attachment points with 2 holes, while SPT systems have a triangular - shaped flange with 3 holes. If your vehicle has an SPT midpipe, check out our Remark SPT axle back exhausts.






Using the Remark Boso Axleback Exhaust is easy. First, make sure your vehicle is a 2015 - 2021 Subaru STI or WRX and that you have a Standard OEM Midpipe or REMARK Midpipe kit. It won't work with aftermarket exhaust systems. For installation, you can directly bolt it onto the OEM or Remark mid Y - pipe. The package includes gaskets and bolts, so you don't need to find extra parts. As for maintenance, since it's made of high - quality 304 stainless steel, it's quite durable. But it's a good idea to check the bolts regularly to make sure they're tight. If you notice any unusual noises or performance changes, it might be time to take a closer look at the exhaust system. Also, keep in mind that if your vehicle has an SPT midpipe, this isn't the right exhaust for you. Instead, check out the Remark SPT axle back exhausts on our site.