lovetoturn

Stage 2 didn't exist at the time. This was the first car to have such a set up and there was even a glitch in the stage 1 timing of the plenum flap opening that had to be fixed. Hence the custom tune. Now every tuner has their version of this in their protunes.

Cargrahpic headers are long tube whereas those Fabspeed ones are short tube, so that may contribute to the power loss at 2500 rpms. Just a thought. At any rate, there is no such loss with CG headers. John at BGB Motorsports usually has them in stock and probably has his own tune to match. That is who I would consult if this is an option that anyone is contemplating.