Who makes best chip for 03 Ranger 4.0 Auto
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I love my Diablo. You can get it off of motorhaven.com, just click on the words "Parts Shop" in the upper right hand corner of the screen. Expect 8-10%HP and 10-15% torque gains. or 17-21 HP and 24-36 ft-lbs. Stay away from jet and hypertech as they only tune at full throttle. Diablo will tune for all throttle positons and makes a real noticeable improvement in all around driveability as well as max performance. I don't know much about the Aptn chip, probably similar to Diablo, but I bought from motorhaven because Ken (webmaster of FTE) owns it and he makes this site possible.