absolutely, i have seen wideband logs of stacked pulleys (21psi) and they get waaaay ugly lean once the boost builds up, watching the afr curve go from a mid 12 to a jump into the 17afr is crazy and very dangerous to the very expensive amg motor!!!!!!!

i assume were hitting the max of the map sensor causing some of the issues but im checkign into that, either way please get a wideband on the car if you try to install them stacked again but i would absolutely not recommend it yet.

does anyone know the map sensors limitation off the top of their head so i wont have to pressurize one with a volt meter?