Hi every one. I'm new to this forum and new to efi live. I've been working on a 1969 Chevelle with a twin turboed ls2 in it. I need a little help with the operating system stuff. The drive train is a 408 with the stock ls2 cam. It has twin gt-32's with an aeromotive fuel system. I'm running a 3 bar gm map. I would like to run SD. It has 75lbs high impedance injectors. My OS# 09381344. If any one would have a base tune that would be great. Thanks and I look forward to learning alot from all of you.