Using your MBRP Armor Pro 3in Cat Back Exhaust is straightforward. First, follow the included installation instructions for a proper bolt - on installation. Once installed, start your Subaru WRX or STI and enjoy the improved power and the moderate exhaust note. When it comes to maintenance, regularly check the exhaust system for any loose bolts or signs of damage. Clean the burnt stainless tips with a mild stainless - steel cleaner to keep them looking great. Avoid driving through extremely deep water as it may cause damage to the exhaust. If you notice any unusual noises or performance issues, it's a good idea to have the exhaust system inspected by a professional.