I'm getting the stage 3 for my cobalt. I'm starting out with the stage 2 from ****, then putting in the stage 3 right after. But the stage 3 for zzp is about 500 and comes with the usual. Now on ****s site they have there stage 3 for 400 with another supercharger!! I haven't look up anything for it yet, but it sounds like the biggest steal. Is there any catches in that...cause it sounds way too hard to believe tthanks.