Are there any performance upgrades, that won't void the warranty?

 

Be a little more specific, like what did you have in mind?

 

CAI, headers, anytype of horsepower increase....

 

Supercharge, NOS, turbo charge, stuff like that will definately voie the warranty, unless you have a bolt on turbo charge and can get it off fast enough, LOL

Catback exhaust should be okay and related stuff like that.

What year andengine? How much of a gain are you looking for in HP, torque?

 

07' CTS Sport 3.6L 255 HP. Looking to get around 300 HP