Ive heard horror stories of hesco raping people. I think you should give walker dyno a try. They will set you up with a guy named Gomer. He does alot of LS1 and LT1 tuning at their shop. And will probably be around $350-$300 for the tune, and then the dyno time. $60 for 3 pulls, or $90 for an hour. I would seriously think about giving them a call.... 661-6986