Hey,
I've been around for a few years, quiet mostly - I've been working on a 4bt project for about 2 years now and have been over on the 4bt forum a little more than here. Since acquiring a new 2007 LB7 I'll try to share what knowledge I have and check out what's going on.
Here's my old LB7 truck. Juice 4.61, Kennedy 4/5" exhaust, UNI filter, H2 Wheels.
Here's the new LBZ - H2 wheels, 265/70/17's pretty much stock for now. Kennedy Tune & Exhaust later!