Any performance gain in using a rzr-s ecu on a stock 08 rzr no changes. Tryed a procom "junk" hard starting all time and missing when running put stock ecu back in. Problem having is cold starting 3 or 4 cranks before it starts and backfiring on decel when running hard at dunes like (dumont). Friends with 09 & 010 "s" donot have this problem is worth the $300. to change ????