Hey there, just wanted to check in here. I have been following posts here for a while now, and finally decided to join. I have a 2004 GMC Sierra 1500 Crew Cab with the 5.3 liter and automatic. I have added 17" Denali Wheels and Yokohama AVS S/T 275-60-17 tires. Mods include: AirRaid replica style cold air intake with AirRaid MIT Tube. MagnaFlow muffler dumped, Throttle Body By-pass trick, Richmond 3.90 Gears, and currently a Street & Performance Electronics Pro-Flash. I will be ordering my Nelson Performance Tuned PCM very soon. Allen, I will be contacting you shortly.