I'm running stock Champion plugs with .032" gap. Mine's an '04 with stock Paxton pulley, Mopar cat-back exhaust and custom tune. I also installed an ATI damper and DLM intercooler for peace of mind. So far I've got about 6K on it with the blower and it runs perfect. Make sure you put the 8:1 washer and ring spacer in the FMU since you installed an aftermarket exhaust or it might lean out, which would not be good.