Using your COBB Stainless Steel Cat Back Exhaust is easy. First, follow the included installation guide. It's an intermediate - level installation, so if you're not experienced, you might want to get help from a professional. Once installed, your exhaust is ready to run with COBB OTS Maps. For maintenance, regularly check the TIG - welded joints to make sure they're in good condition. Since it's made of 304 stainless steel, it's quite durable, but you can clean it with a mild stainless - steel cleaner to keep it looking shiny. If you're using a stock j pipe or downpipe, remember to use the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046 as required.