Hello to all. I have 2005 silverado 5.3z71 ext. Cab. And it's awesome. I also have a yamaha 1000 fz1 and dodge srt10 ram. The problem is when I drive either of the two they get my blood flowing. But when I get in the chevy it feels like a dog. And that is presisly what I plan on changing, and ls1 trucks has already been lots of help. I will definitely post threads of upgrades as they happen! Really look forward to advise from some pros.