Stage 4 has raised boost, increased timing, transmission mods with the least amount of torque management, removed speed limiter, and max power. requires 91 or 93 octane.
Stage 4 plus has the same as stage 4 only difference is in 4 plus the boost is carried out until the shiftpoint. All other versions of our tunes mimic the factory boost curve and taper off at higher RPM points. Stage4 plus is a RACE ORIENTED tune.