As stated before, fit, finish, and custmoer service is excellent. Have 1-7/8" TTI headers to 3" TTI X-pipe system to the back on '72 RR (orig. Calif exhaust, so turndowns). If you have a factory trans in there, should be a piece of cake. If it's an aftermarket trans (like mine and 72RoadRunnerGTX - namely Keisler Tremec), you might have to do some dorking around with it to make it fit the way you like.

In my case, I had to get different header collector adapters (from TTI - they make 'em for this reason, apparently) that exited the collectors at a different angle so they wouldn't pass too low under the trans/T-bar crossmember.