Exhaust Systems: Stock vs. Aftermarket What is an exhaust system and what does it do? Read here Up Pipes Not all up pipes are created equal! Do your research to find the perfect material and design for your Subi's needs. Read here Down Pipes Cat's outta the bag (or not)! Downpipes come in high-flow cat or catless options, improving exhaust flow and potentially adding power. Read here Headers Feeling the lag? New headers might be the missing piece for a smoother, faster ride. Read here