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got my 88 coupe back...but the cats glow red hot??
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.
another +1 for the cats being clogged! ...could be anything, perhaps leaded race fuel was in the car at one time! ...just change the h-pipe and you'll be good to go!
I just skimmed thru this but are you running the stock h pipe with that? I would just cut the pipe off after the cat that is glowing (do both sides) and take a breaker bar (or equivalent) and bust out the cat, start it up and blow all the stuff out and see how it runs. If you have a clogged cat your car should run like crap at the same time.