On my last project a 95 Mustang Cobra I Steeda exhaust system. On my project prior to that 1986 Iroc-z Camaro I used Hooker setup from the heads to the tail pipes. Prior to that On my 1985 mustang GT I used Flowmaster setup. Also on my list 1969 Grand prix model "J", 1966 GTO, 1985 Chevy Blazer (had to try the 4x4 thing) 1978 Trans Am. This my first import project not my first project car. Is it really that hard to believe they were made correctly and installed with ease?