Turbo Grand Prix GTP Dyno's 593 WHP

My '99 GTP turbo strapped down for the first time since the Cartuning Kit

More Videos...

V6 Grand Prix 3800 Turbo
Grand Prix v6 3800 turbo bullseye

450WHP Turbo GTP Dyno 1
ZZPerformance in Grand Rapids, MI Grand Prix GTP turbo. PT67 turbo.

Turbo Grand Prix GXP LS4 Cartuning Kit - 466 WHP Dyno
2006 Grand Prix LS4 5.3L Pull done through the Exhaust (no cut-out) with open cat. Cartuning Performance turbo Kit, 72/68 turbonetics turbo, 14* timing. Approx 9-10 psi (the gauge we were using was sitting at 3.5 psi before we connected it to the car). 466 WHP 470 TQ

1999 Grand Prix GTP turbo Exhaust
Open cutout