I was thinkin headers for my integra. I useto have a 1990 integra but then my brother bought a 92 integra 5 speed and decided that he wanted the red one cuz of less miles. But anyways I have a 1992 acura integra RS 5 speed all stock right now. The only thing I have is 15"rims and 4 inch fart can. How much HP do headers even give out? If any?