Just got off the dyno today with my 2010 Bulldog. 111 S&S (5,200 miles) Fuel Injected, S&S VFI Stock 52mm Throttle Body Stock Heads 580 Beehive Springs Non Roller Rockers 546 Cam (as far as I know) Stock head pipes with Mean Mother Mufflers with baffles installed. Stock Air Filter All Synthetic Oil 91 Octane I did two series of pulls. The first with stock air cleaner assy in place and the second with air cleaner cover and filter off. Best air cleaner on... 98 hp and 104 tq Best air cleaner off...101 hp and 107 tq.