I have the gm stage 2 and i am wanting to go down to a 2.85, i have already concluded that i am going to get a tune(i know it defeats the purpose of stage 2) but i was wondering if i have problems can i switch back to the stage 2 pulley and bring the car in for warranty work without the dealer noticing the tune. If i can i was also wondering what supporting mods i would need for the 2.85, heat ex changer, different hub etc.

Thanks