10. I already have a tuner from SCT, Bully Dog, Spartan, etc. Is this FICM tune compatible?
Yes! These other tuners tune only the ECM, not the FICM. The ECM, among other things, provides instructions to the FICM. When the FICM is programmed with a PHP tune, your ECM tune is not impacted. Rather, having the FICM tuned in many ways removes the limitations that the ECM has to live within!