As I understand it..the slave cylinder is the same thing as a throw out bearing (FWD vs RWD lingo). Its always wise to replace all 3, as the hassle involved just to seperate the tranny from the engine is quite large! I talked to Eric at BAT, and Terry Haines of HMS Inc, and they both feel that the stock clutch will handle 220 hp well if you're good with the clutch and stick. If you plan on the 1/4 mile, another clutch may be needed.