I had an 05 F150 STX 4.6 I only had an exhuast on it and i still noticed the same thing about it. In Ga on 75 S you can open it up a little due to the Speed limit being higher and I always got great numbers going to and from Atlanta
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 2000 F350 AFE Stage 2, 5" MBRP with 6" tip and a PHP FU chip
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