running TTI 1 7/8 on the 383. Went in fairly eaily. Had to get the motor up and rotate the wheels (forgot to do this at first causing quite a littany of swears!) Running a Dakota starter so no real issues other than getting the wiring done was kind of a pain.

Only major problem is that the #3 plug lies RIGHT on the header and burns the wire. A shorty plug should work better with boots...add it to the list.

The old MP headers I had leaked like a sieve and could give you heat stroke when you opened the hood. Now no leaks and the engine bay is much cooler.

A lot of money but a very good product IMO.