Saab 900 turbo What is the difference between 900 S and 900 turbo? intercooler and intake prime gear 7 (not 6) APC system APC is a system that allows you to delay the opening of the wastgate, so that instead of the base pressure (0.4 bar) you get 0.85 bar. Factory data: 900/900S/Convertible (lpt) – […]