Reddit mentions of 2011-2013 Dodge Challenger SRT-8 Front Spoiler Air Dam MOPAR GENUINE OEM

Buy some Eibach lowering springs.

Pro kit = 1.6" drop, Sportline = 2" drop

The body roll on challengers is insane, it's honestly like an SUV. The lowering springs will dramatically reduce it. Some people will say it makes the ride harsh, not really. I've had mine for a few years and I greatly prefer it over the super soft, extra bouncy setup that comes stock. The new springs will make the car handle more like it should and greatly improve the look by closing up the massive wheel well gap.

http://www.autoanything.com/suspension-systems/Dodge/Challenger/111A50469A50471A0A23A784A1.aspx

If you really want to have great handling, get the front & rear sway bars as well.

http://www.autoanything.com/suspension-systems/73A5957A0A0.aspx

I definitely would recommend a resonator delete also. It'll give you a much louder, deeper, throatier sound befitting a muscle car. It won't be crazy loud, just more proper. It'll cost you about $200 at a muffler shop.

A Diablo sport tuner would also be a great investment! It'll unlock a few extra HP, greatly improving the shifting on an automatic transmission, as well as turn off MDS and skip shift.

http://www.speedlogixstore.com/product-p/i-1000-dcx.htm

On Amazon you can get an 392 SRT chin spoiler for about $100 dollar + $20 shipping, it won't do brake cooling unless you buy the SRT belly pan but you absolutely don't need the SRT belly pan to install the SRT 392 chin spoiler. I recommend the chin spoiler just because it gives the car a much more aggressive look.

http://www.amazon.com/2011-2013-Dodge-Challenger-Spoiler-GENUINE/dp/B00CUDFMXK/ref=sr_1_1?s=automotive&ie=UTF8&qid=1411868948&sr=1-1&keywords=challenger+chin+spoiler

When parts shopping, I recommend Amazon & Speedlogix. They'll have everything you need, but if you do some googling you can usually find some things $10, $20 cheaper here & there at other websites.

Remember, if you buy an HID kit you will need new headlight housings for hose HIDs to work properly. Don't be one of those D-bags who buys HIDs and then puts them in Halogen housings and blinds everybody. You will be hated and, in some states, ticketed.

If you do go HID and buy new housings, go with the CCFL HID Halo housing. They look amazing with the blacked out option and come with CCFL halos similar to the ones on BMWs. It's also a much cheaper (and more tasteful) option for halos as opposed to Oracle which will cost you much, much more. With the oracle you'll need the kit, hid housing, plus install, and it gets expensive! With the CCFL housings it's all-inclusive and install is just 'plug &play'. Here you can get the CCFL halo housing + HID Kit and warning canceler for $390, it's a great deal! You wont find a better one.

http://www.protuninglab.com/hidxe08dochc.html

Other than that, a Cold Air Intake, a Oil Catch Can, and black chrome grille surround are all good mods as well.