Thread: do i need custom tunes after muffler change
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Old Fri, July 31st, 2009, 09:15 PM
Shorse Shorse is offline
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Join Date: Mar 2009
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i did not know mufflers had to break in... good to know.

so he can make me a tune aimed at fuel savings and performance, what form do i fill out?
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2010 F150 XLT with the 3 valve 4.6 and 6 speed auto