i loved my MPI once i got it running. it took two seasons to get the bugs worked out. and with MPI's customer service it made it that much harder. that sled went through belts every 40-50 miles. something was weird with my supercharger/engine placment and my tensioner was to close to the other side of my belt. when the rubber mounted motor torqued the belt would slap and tear off cogs. we couldnt get MPI to send us bigger pullys for both ends (to keep the belt from slapping and keep the same boost) it took forever to get that all worked out. i had a few other problems with the system too but that was the major deal.