Not Ranked
I've had two Roush Mustangs, one 4.6 and one 5.0. Both used completely stock Mustang GT blocks. The stock 4.6 handled 500+ hp and the 5.0 handles close to 700 hp easy. No need to do any internal engine work with a Roush setup. Plenty of Mustang guys running blowers with stock internals. VMP sells a good Roush - type supercharger. He has some really good tunes for automatics. His wife's Mustang is one of the quickest stock automatic Mustangs in the country.
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Looking at Backdraft
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