im taking my 350 csb out of a 86 regal and my first question is will the headers clear in the 78 the same as the 86 and im going down to get dual exhaust installed and ive heard about h pipe x pipe turn downs ect im looking for a good rumble and ive got a good bump stick(cam) haha someone said that the other day and i like sorry i had to use it.but what flowmasters series and h pipe or x pipe have some of you guys found to be the best....