I have the 1:78 DP-D outdrive now. Brand new August last year after I chewed the gears on my old one. My old one was the same ratio, but I think it was a DP-C. I can turn B5s, but they cavitated too much. The A4s are the best I've ever had. Tried B3, B4, and B5 last year, not as good. Got a set of A5s I could try, but I like not seeing the temp get close to hot no matter the chop, load, speed.