I just finished the Pypes exhaust install on my 1968 Mustang hardtop. Install was time consuming, but it came out great. I tig welded all the joints and used Dynatech V clamps on the muffler to tailpipe connections for easy disassembly. The street pro mufflers sound great. I had F brand mufflers before and had a terrible drone inside the car. That has been eliminated now, and the car is much more enjoyable to drive.