When it comes to engine work I just pulled a bunch of weight/junk over the winter and put in new plugs and wires along with e PCM I got from Ion.

Last year with the 2.73 gear (3.42 now, that I got with a 10 bolt) I was on the back bumper of two low to mid 13 sec LS1 cars and beating 04 GT 5 speeds, just had CAI and free mods then.
I bought a GMPP CAI off of a member here and well the filters were shot and I thought they were good at the time and I NOW have new filters and trust me they are not cheap. I pulled the plugs and the center electrodes were worn away really bad and I could tell the car was running ritch. I put in new MSD wires, new plugs, pulled the A/C, sway bar, and AIR and found a cool way to re route the wires on the passenger side, there is a small hole just below the power steering pump that they all fit threw nicley so now if I have to change plugs and wires again it will be a two hour job not an all day job. With all that junk out of there is really claned up the engine bay a lot. installed a new belt and flushed the coolant and threw in some water wetter and the car sounds so much better now and last year I thought it sounded great. Only problem is that after a few minutes the upper radiator hose was still cold and the car was near the red for temps. I only flushed out the radiator and not the entire system but I assume there is air in the system and thats why its doing that.
Car should run really strong with all the new parts (see page two in site in sig). One more month....