06 Commander: 4.7L V8, AEM brute force CAI, MBRP Cat-Back Stainless Exhaust, Superchips Flash Pak, 2.25" lift w/ RR rear shocks, 31" Dune Grapplers on A/R rims, Custom Backdraft full side flames, chrome package & lighting (don't get fooled get the 4" lift).
I did everything except the lift and tires myself in 1-weekend. There are on a few ways to go with the "street legal" mods. If you really want to drive an animal, you need to go to a Specialty Jeep Center, or a legit speed shop. Jeeps are unique like exotic sports cars...you don't want Pep Boys doing the mods (unless the mechanic is a jeep enthusiast-you can tell by what they drive).
All of the performance mods were easy and did not require a bunch of special equipment.
The Cold Air Intake gives the engine a great gushing sound, and with the exhaust my Jeep sounds powerful ( I just need to get it to burn the tires off). The CAI, Cat-Back, and Flash Paq added noticable horse power, speed, and actually more efficent fuel usage (this might be the placebo effect...but I am happy).
I bought ALL of my parts from auotanything online. Decent prices, knowledgable reps, and great customer service.
It is a shame I spent so much money so far, because I am looking to go to a 4" lift, spacers, and more aggressive tires. Plus I am either going to get the engine stroked, or get a supercharger.
Best of Luck