I have a Duramax that I have tuned with efi live and dsp5 but don't know much about efi on gassers. Who's the man that can hook me up with tuning? Also this Tahoe is 4x4 with a 3" body lift. I will be taking the body lift off and lowering 2/4 to make it easier on the kids and wife. Any recommendations for lowering kit? I have never lowered a 4x4. Also looking to trade the black 17" wheels with brand new 275 bf Goodrich all terrain tko's for some factory 20's with good tires. I appreciate any info guys.