Im back again with the stupid questions. I would like to run the 1bar map rtt os on my tahoe but i have no idea what im doing. I need some guidance on what swapinf the os does and how it benefits me aside from the obvious. I had my 0411 mail order tuned and it ran good but startup was horrible and the shifting sucked. I have most of that figured out now but i would lile to be able to use the rtt function. Is this even worth my time? Im running a lt4 hot cam with 1.6 rockers and heads have been milled with metal shim headgaskets and flat top pistons. Bore and stroke stock and intake is stock. I am completely new to tuning and any help and advise will be appreciated. One day ill get the 5.3 in. Tia.