My .02 - do the subframes first. I have an 86GT convertible. Bought the Groundpounder subs for $69 from Central Coast Mustang. I had no idea I would notice this much of a difference, but it's SO much more solid now. My top doesn't rattle against the windshield anymore.
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86 GT, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms.
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