In my opinion, if you put the time and MONEY into sleeving a gsr (which can be a bad machine), why you can't spend the money to get it towed to the shop where you get it tuned? Not trying to be an asshole, but no sense in risking the logevity of such a bad ass motor. Just my opinion. scotty @ mainstream tuned my boosted ls and still runs strong after about 7 months at 9.5psi stock block. Mad props, highly recommend!!