What or any exhaust system to boost HP?

 

You might gain a couple horses or a few with a cat back exhaust but nothing to really Boost your hp,if you want to really boost you HP then engine power adders and a Dyno tune is where it's other then that with the right bolt ons like CAI,Headers,cat back exhaust and a tune you can get 15-25 more ponies I'm told,maybe a bit more.