Yank ST/SP/YPE/SS, what's the difference?
SS = Good street & strip converter
YTP = Best max performance converter, but very loose feeling.
"E" suffix = Extreme. Converter is designed for FI applications.
Pump & Stator combinations change between lines. Extreme converters have (or had) a posi-lockup clutch that engaged at 475 ft-lbs.

