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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.
Yes I can tell a little improvement in horsepower. I notice that from take off that I have to shift quicker because of reaching higher rpm quicker. What I mean is that it seems to breath better, and the sound is a little deeper. As far as proof I have none because I haven't had it on a dyno. Now my plans are to replace exhaust from the axle back because it still has the stock mufflers and pipe. My H pipe is not stock, so after axle back change I will be done with that.
Ok on getting rid of stock mufflers. Did you let someone do it, or did you do it yourself?Also are there different grades of flowmasters and what kind of tips did you use?