Ok, i have a 2007 polaris predator 500 and it needs an engine upgrade. i already have a trinity stage 4 exbaust, 15 tooth sprocket and shaved fenders. its not enough juice, so im looking into the 558 bbk. the kit will come with a 12:5 compression piston, sleeves, pins and the whole 9 yards. ive looked up you need to run a carb from a trx450r, is this true? and does the carb have to be year specific? how much would it cost for everything to be installed? and can you run 93 octane pump with this big bore?