heres why I decided the way I did, FI's and Berks are built to order, there is a wait for both. I'm one of the most impatient people i know, if i order something, I WANT IT NOW!!!! I weighed the positives and negatives of the different exhausts, FI and Stillen made the same power, Stillen looked more stock which is what im going for, Stillen shipped the same day... but as far as sound goes, I think the FI's are better.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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