Using your Remark sports touring cat - back exhaust is straightforward. First, make sure your vehicle is parked on a flat surface and the engine is cool. Follow the included instructions to bolt on the 3 - piece design to your Subaru WRX or STI from 2015 - 2021. The exhaust is designed to fit using the factory OEM hanger rod construction, so it should align easily. When driving, enjoy the rich, powerful exhaust note and the performance boost. For maintenance, regularly check the exhaust for any signs of damage, like cracks or loose bolts. If you notice any issues, have them fixed right away. To keep the stainless steel tips looking shiny, you can use a mild stainless - steel cleaner. Avoid using harsh chemicals as they may damage the finish. Also, make sure to clean the exhaust after driving in dirty or salty conditions to prevent corrosion.