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Also the flowmaster muffler alone is not going to give you 10 to 15 more HP over stock. I don't think they improve exhaust flow that much...maybe 2-3 HP if that. With duals you might gain 10HP depending on the brand...Do some research online and see what you can find out. GOOD LUCK!
Cheers! [/B][/QUOTE]
well it depends but with duals u get up to 20 hp more and plus if they put in a bigger pipe for the exhaust can also increase hp cause its more that goes out and not less and ford mufflers are more restrictive then the flowmasters i put in a single exhaust with 2 and 1/4 exhaust with an aerochamer muffler and according to them they said they are alot better in performance then the single flowmasters and i noticed a big difference in hp and acceleration
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