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Gxp whp

2K views 6 replies 6 participants last post by  boardkat 
#1 ·
What is the stock WHP for a GXP? I know Gm rates they at 260HP. I'm thinking about getting mine dyno tune.
 
#6 ·
Dave has my car. He did a tune and measured 305 HP at the wheels. It has charge tubes, Dejon IC Solo high flow cat, and GMPP tune parts. He said it was putting down about 370 ft pounds. All after he tuned it.
 
#7 ·
on my '07 gxp 5MT, stock (no tune) w/ a K&N filter in the factory airbox and SOLO performance street race exhaust, i put down 238WHP and 242WTQ on a DynoDynamics. 400ft elevation, 65deg, can't remember the humidity or correction.
 
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