Whatever you do, don't buy a 2-cat H-pipe. They are a little louder than the 4 cat and let some horses loose, but they are very expensive and in my opinion not worth it. Go with an off-road pipe. They are much cheaper and you will really get the "true" sound of a stang. I had a MAC 2.5 2 hi-flow cat h-pipe and it cost me about $400 w/ shipping. And it only made my car a little more throatier and richer sounding than the stock h-pipe. If you need to pass emissions, don't waste your money. Either just keep the stock pipe on or buy an off-road and switch over every 2 years to get your sticker. Take it from someone who has had a 2 cat pipe
