The stock ones I put to sleep with no problem at all. A few modded ones gave a little more of a run, but in the end no match for a modded SC GT.
2007 Pontiac Grand Prix GT Series III 3.8 Super Charged AL 104's Plugs, 180* T-Stat, Tuned PCM , Custom CAI is complete and installed, AeroForce Interceptor gauge, Smoothflow 3.5 pulley with 0* KR, SSAC SS Headers. 6000K HID