Alright... i have a buddy tellin me he can beat me in his basicly stock civic. DX. Single cam non vtec all that shit. Anyways, he thinks my car only gained 12 horsepower with a big 3" intake, headers, and exhaust. However, its not a true exhaust. Stock piping with a welded on HKS dragger muffler. I plan I getting a full catback but ya. Oh and by the way, the racing is done on a track. Ha. So my question is about how much horsepower would I gain from the intake, headers, and muffler? Just a curiosity thing. Thanks!!