I have a Black Bear tune on my current 03 silverado. It has the 5.3. IT made the truck so much more drivable, the more I drove it the more power I felt. Drives so much better than it did stock. Great customer service. They use EFI live and how it works is you put a deposit down, they send you...
HI everybody. Saw a link for your site learning about Duramax's. IM in the process of a new truck. I have an 03 silverado quadrasteer. Quadrasteer is awsome, but the 5.3 even with a custom tune isn't cutting it for work. Im a contractor/architect for my familys business and I tow about 6-8k...