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While GM may have softened the GXP for the average GXP buyer you may be able to tighten it up by using the Z0K springs. They'll drop the car a little and even though they are supposed to have the same spring rate it should make the car handle a little crisper.
But before I did any of that I would have the alignment checked. Just having a sub-standard alignment could be making your car handle like a pig.
I'd go and have them lazer align the car to be just barely within the green range (on the agressive side), maybe a little more negative camber than "acceptable" in the front.
I know GM does not spend a lot of time aligning the cars out of the factory. My factory alignment on the Z0K had huge cross-toe and cross-caster. I'd spend the money to have a good alignment tech look at your car.
Definitely put some more negative camber in the front and rear.
(Front spec is 0.10-1.10 degrees, I'd go with 1.10-1.30; Rear spec is 0.00-1.00, I'd go wtih 0.7-0.95)
Go with 0 toe for tire wear, and have them max out the caster in the front.
If the tech can, make sure he gets everything as close as possible side-to-side and make him give you a print out of the specs before and after.
Last edited by Miles@tirerack : 03-21-2007 at 02:59 PM.
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