my friends got a 95 integra with a gsr swap(b18c1) and we bought a cheap ssac kit for it....we want to run around 300 hp on the stock motor......i was thinking 550cc rc injectors? and i was wondering if 2.5" downpipe and exhaust would work on the car? he doesnt want it to loud and the downpipe that comes with it is 2.5"