Ok mine goes all the way up to 6-7krpm no problem in nuetral or in gear. I think the atx's are set up this way so you don't damage the tranny if you do a park to drive drop while reving the motor.
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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