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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I also ran flows on my 88 and I really liked the sound but I just wanted to get something different so I put SLP's on my 93. After running SLP's I will never go back to anything else. Plus the quality of SLP's compared to flows isnt even funny. Flows sound good but like I said, I just wanted to be different.
I have a brand new American Thunder system. It was just installed on the car when I bought it back in Feb. The guy whom I bought the car from had not properly fitted or tightened anything so I uninstalled and reinstalled it properly. The fit and quality was very dissapointing. For example, 1 of the tailpipes has the hanger welded to the wrong side and even after bending and modifying, my left tailpipe is too close to the tire. The pipes would not center correctly no matter how hard we tried. If it wasn't brand new, I would have already installed a Bassani or SLP system. It does sound pretty good though.