Hey man welcome to the Avenger life! I have a 2012 SXT Plus and I've done a few cosmetic mods, I've done a couple of suttle ones like a DODGE Banner you can get at Autozone, I use universal front lip and side skirts and just custom-fit them (you will have to do some cutting and measuring). The viper kit you're talking about doesn't work for any 2nd gen avengers, only the first gen although it it is a very nice kit. 2nd gen would start from '08 to '14. In my honest opinion I would say first off the best thing you would want to do is lower it and put some nice new wheels. If you choose to do black then you could still lower it but in my opinion black wheels look best with the stock height. Also a spoiler is great for these, I think without a spoiler they look a bit weird. There are factory ones for the 2nd gen avengers. It's all personal preference and make sure to have a plan! The main websites I use for my aftermarket parts are Car ID and Ebay.