Exterior wise there are several differences to help you identify different models. In addition to those listed by ATX3HUNNID and 300Chick, a C will have different tail lights and dual exhausts (SRT will too and also has the trunk spoiler on earlier models). Wheels are also different as noted with the AWD models having their own unique wheel. Fog lights also provide some identity, with base models having none, limiteds having smaller versions, and C's and SRT's having larger lamps. A while back, someone posted pictures and pointed out the unique exterior features on each. If you do a search, you can probably find it for visual reference. Have fun playing "spot the 300" with your family and friends.
Easiest way to tell a 6 from an 8 is to look at the front bumper, next way is the mirrors (already pointed out), then the tail lights/exhaust (yay! rear end!)
The touring and the base models with the "great american package" share the same 17" wheels. The SRT designs have 20s that are narrower than the 20s used on the SRT8s
Engine bay? Ridiculously easy - SRT8s have no engine cover and use an aluminum intake manifold instead of the plastic one on the 5.7 - the 2.7 has 'half' a manifold compared to that of the 3.5.
Another way to tell a V8 vs a V6 is the V8 300s are the only LX with a power steering column, but that's something you'll have to get in the car to notice, and by then you'll notice all sorts of other give aways.
I can always tell by the front of the car. The lights and vents are a dead giveaway to what model it is. Then obviously the rear, and the badges. I always love seeing srt8's around. In my opinion the srt8 is just the perfect look for the 300. The front lip and the spoiler in the back along with the 20 inch wheels is just so damn clean and tasteful.
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