I have always wanted a Tahoe/Yukon to perform as good as a stock Trailblazer SS or better. Then GM introduced the Tahoe RST but I have always loved the GMT800 body style. I have gotten close improving everything but the power before selling it. Now with my 06 Yukon I am in the process of perfecting the suspension stance and handling. Upgrading the brakes and wheel and tire package. My question is what is the fastest NA GMT800? I could easily add boost but using the parts I have from 2 other projects will hopefully get the Yukon in the mid to upper 13s. That's my goal atleast, what has been accomplished over the years with this platform and what are some of the shortcomings people pushing them have run into?