I ordered my Nelson 93 tune today!!! I told Allen that I wanted the most performance he recommended for my current setup and that I liked to race!!!LOL--Like all of us! So take care of me Allen I have 03' Silverado 4.8 stock 3:42 open diff(FOR NOW) and the only mods are FIPK II and 50 Series flows the rest stock FOR NOW! What should I expect guys!!!!!!!!!& #33;!