hasport has the cable to hydro conversion kit.....so you can use either

on another note i build and rebuild honda transmissions. no dohc tranny is stronger in terms on lasting. all share the same weaknesses. maybe you mean stronger as in ass dyno comparing acceleration or something? heres the best accel geared trannies avail for the s80 casing. b18c5 is stronger(accel) as per gearing and lsd
Y80 USDM B18C1 3.230 1.900 1.360 1.034 0.787 3.000 4.400
S80 w/LSD USDM B18C5 3.230 2.105 1.458 1.107 0.848 3.000 4.400