I know I'm not a Weber guy, but I will agree with the great gain in lower end. Of course this is probably subject to the cam each of us are running. With my Mikuni's I kept pushing the envelope of the pilot side by seeing how rich I could get it. When I thought I was putting too much emphasis on the pilots and tried making corrections elsewhere, I would still be fighting the 'dead spot'. I started with 200 main airs and ended up with 180's. Started with 57.5 pilots and ended up with 67.5's. Had 40's acc.pumps and went back to 47's. In MY CASE, my motor wanted it down low. My engine pulls hard right from 1500rpm straight thru to 6000rpm. Only on a dyno will I know for sure what the number look like. I am idling anywhere from 12 to 13, and cruise is around 14 AFR. As I have read before, they like to run rich. Thus the advantage of EFI, nice lean idle and cruise, then dial in the power zone. Makes me want ITB's even more.