I'm not sure what the 2.5 runs for spur gear but I'm running a 58 tooth spur and a 22 tooth clutch bell on my 3.3 and it will do wheelies rite into 2nd gear...if its tuned rite and it wont do wheelies u'll have to gear it down so you get some more tourque.....beware that doing this will drop ur topspeed.......also u can try loading ur front shocks by hitting the breaks then mash the gas full throttle