I did a keihn carb comparison last weekend on my mx ported stroker.With 28d slide pwk's ,34 flat slide pj's,35pwk d slides.They 28's had the most snap out of the hole but fell short compaired to the 34's+35's through the mid+topend.They 34's were much more difficult to dial in+they did'nt idle to well.The 35's were the clear winner.I thought the throttle responce from either pwk was superior to the pj's.