May i suggest the first thing i done to my 03 Pick up was "Flash" the computer......The timing from the factory is so retarded it's a wonder it even ran....we changed it by almost 30 degree's....(But you will have to run 93% octane afterward's)Then i installed a cold air intake with a K&N filter & the corvette survo's in the transmission.....And the a flow master muffler (uno)(ONE)(1)I was told you can let it breath to much as well....it need's some back pressure...
But at this point everything has worked well and the truck run's wicked for a little 5.3..
Also have the 03 factory SS (20)wheel's & tire's (what's left of them) but they help with hooking up!As soon as i recover from the "Vette".......It will be supercharged "OR" a turbo & some tire's
...Then look out we will have fun "or" we will tare up some S$$$!
"Goodluck" with your project"...Dan