Flowmaster generics; good and loud. Eaton Tracloc on the way. Gears to follow. Gotta stop going on the net after 3 beers. Went to get gears from Brenspeed as I bought a tuner and their tunes, custom. The Brenspeed gears for Mustang are confusing. Someone go to Brenspeed.com and check the '04 Mustang 373 vs. the '05 Mustang 373 P/N and tell me the difference. I have an '04 CVPI & will a "Ford-Head" certified mechanic need "the master install kit", ??