If your going to get a jrsc. Whats the best size header and exhaust combo? I keep reading a header with a 2.5 inch collecter and 2.5 inch exhaust is the best. I am thinking about buying a jrsc and getting either a jdm or kamakaze header. I head the kamaz header is the best performing header, but the quality is not there at all. 4-1 is the best for jrsc due do the jrsc making nice bottom end right?? Whats a nice exhaust for the jrsc