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Old 10-15-2009   #1 (permalink)
supersnake730 is offline Apprentice


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pheonix   Arizona
Default 2 1/2 over axle on 2003 Mustang GT

I have LT headers with a catted H an straight pipes...from the straights back its 2 1/4 does that affect it alot for sound,power should i change it
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Old 10-15-2009   #2 (permalink)
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Del Norte   Colorado
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Leave it, or go to 2.5. You need some back pressure, and opening it up too much you will loose power.
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