My buddie has the same machine it is just under powered other than that all around great machine. you can do quite a few mods to it. You have a wet clutch for the engagement Rpm you can change the springs on. I also would look into the coop 45 mod. Not too sure if Coop 45 still doing it but I'm sure there's others that are. At one very brief moment he had nearly comparable power to my brute. But to be fair I was bone stock engine jetted, clutch kit, Dyna tech CDI, and 3" and snorkels. If I recall right he was clutched, high compression piston, cam, full exhaust and some sort of Dynatek fuel programmer at that time.
THERE IS NO REPLACEMENT FOR DISPLACEMENT
07 BRUTE FORCE 840i FST
3" MANDRAL BENT SNORKEL, BIG GUN FULL EXH, JETED 170 F 175 R, Dyna fully programmable cdi, Dyna coils, VFJ stage 3 spider mod Clutch, racked radiator, CUSTOM FULL SKID"S by me, CUSTOM REAR BUMPER by me, CUSTOM reinforced stock rims by me,
mrs. Fabman. 05 Brute Force 750 3000lbs winch 4' plow
Fabjr. Polaris Scrambler 400
Little Miss broke it. Apex 90 cc pro shark