Just picked up a 91 CRX SI with a B18b1 block and a B18c1 head. The tranny is a 5 speed B16 tranny. When I first got it it seem like it was hitting but now that we put a new GSR header and hiflo cat in, its not hitting anymore. Could someone please help? Also we just replaced the timming belt and we made sure all liine were lined up and the timming still seems to be off. Could this be why??