Reguardless of what people say make sure you watch your trucks parameters very closely when stacking anything w/ that Crazy Larry. Stacking to begin with is risky and IMO should only be done on trucks w/ RP and or FP gauges, upgraded turbo/s and fueling mods (injectors is a plus). I personally won't even think about stacking anything on top of my BD CL (when I do run it) , seems to be plenty of power to me. Not trying to be his mom, just trying to save him the trouble of ruining something.