I have a 03' FX4 with a 5.4 and 3.55ls rearend. Cai and Exhaust and Gryphon using canned tunes. Using the tow tune the best 0-60 I got was a 8.62... After seeing people getting mid 7s to high 7s, to me that is horrible.. And I don't break traction either.. Feels like I lose power of the line, like it lags. And then it lags at 55mph..
My buddies 04' FX4 with exhaust and Edge ran a 7.6, he just installed a CAI and ran a 7.2...
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