My friend has a parts car .the car is a 85 RX7 with a 4 speed auto trans.it has a RB header. My question is will this header fit my 84 RX7 with a 5 speed manual trans?? I also went to the "Racing Beat "website and they do make a header for a automatic trans, and one for a manual trans.What is the difference of these headers??Thanks Guys.