Welcome and thanks to you and your buddies for serving our country! 15.5 is not a bad time for a stock set up! I ran 19.9 with mine stock. Ask lots of questions, there are a few trucks like yours with the setup you are planning. Man trucks clubs sure are alot of fun, you should start one!
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning