When I bought my Mach 1, it had a MAC catback system installed on it. I wasn't too pleased with the sound so I started looking around for a new cat-back system. I listened to a bunch of sound clips and I decided on the Flowmaster American Thunder system. To me, it has the best sound for the money and the quality of the exhaust is excellent. I was able to install the system myself in about an hour or so with no major tools. I also had a Flowmaster American Thunder cat-back on my 95 5.0 and it sounded awesome!
I definitely recommend this exhaust system!