I did the GMPP Axle-back exhaust, then a AIRAID CAI, then a tune. I have the manual LS3, I am pretty happy with the sound & performance increases of my mods so far. There are other members who have posted better gains using other manufacturers, but I really like the sound the GMPP exhaust puts out, and I don't need every neighbor to know when I come down the block if it's 3am and I don't want attention. Like kitty said, do the reasearch, Powerfreak has posted some really good results from Vararam, but his was a prototype/beta model, from what I understand there are still restraints on thier CAI. So keep in mind even though the LS# engines have been around quite a while that you are still in 2010, and that is the year your car is, there will be advances and better products as time goes by, don't be too antsy to get through the bolt-ons, it is going to be like a computer for a while, what you buy today will be out classed in 6 months.
Last edited by cigam21; 05-17-2010 at 10:14 AM.