Quote:
A properly set up 904 is a MAJOR difference from a 790 or 865 with all the normal mods. There is a huge torque difference (66 ft. lbs. @ 3400 on dyno) making it like you definitely put a larger engine in the bike.
I'll second that! I rode a buddys 790 with opened up airbox and exhaust (rejetted of course) about 40 miles this afternoon. After having my 904 for about 20,000 miles, i had forgotten how big a difference it made. Holy cow! I am still VERY happy with my 904. The 790 just plain feels weak. The 904 has never left me with that feeling. It's no torque monster, but the bike definitely doesn't feel underpowered like the 790. 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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