I like this "thinner" air cleaner better. More leg room, and I swear it runs better with more response and low-end torque. Could be my jetting/air mixture, or maybe just air where you want it ? It just runs better. Less spitting, everything. You need to add the old-style enrichener, but it 's the same as a Super B. It took some machining and drilling to make the backing plate fit, but it was worth the effort. I made a pattern of the holes, etc., and took it to my machinist. The polished looks goes better with the polished covers too . . .