I have a 2004 gmc 6.6L duramax with a 6" lift and 35" tires and just starting to look into buying upgrades for the truck i was looking for somthing not to extreme just maybe intake, exhaust and a tuner for a little more power and better fuel economy i was looking at the bully dog E3 tuner not sure if good? and i was also looking at BANKS complete stinger system that includes everything i want not sure whats the best?

If you are looking at a complete package the stinger kit is a good place to start. There are other more economical ways to go about it, but that would be up to you. I would look into a PPE standard tuner, pillar gauges, S&B Intake and a Turbo back exhaust from MBRP or Magnaflow.

Let me know if I can help.

Chad

Not sure by 2004 if it's an LB7 or LLY but this is moved to 2nd gen electronics.