The other principal change is that the Stage one package comes with just one 92mm GT500 throttle body, whilst the Stage 2 package includes the billet 112mm round throttle entire body (which uses GT500 electronics) that we talked over before. Enormous outsized aluminum intercooler reservoir (in excess of two gallons) https://whipple-ford-mustang24680.dailyblogzz.com/25302913/2007-ford-mustang-gt-whipple-supercharger-no-further-a-mystery