Ways to tell the 11s from the 10s
 

Other than the obvious duals, is there any other cosmetic differences that can distinguish the two?

I'm not 100% but don't the 11's have a more prominent cowl hood? The rims are another thing but those can be easily changed.

Not so much cosmetic but at a red light there's a difference I believe

2011's have a bigger chin spoiler and the blind spot mirrors

they 11 comes with a chin? i know the special ed ones did but just a appearance pack or a base model does too?

Dual exhaust, blind spot mirrors, more hp, different speedometer top speed! Otherwise identical

Oh yea and 6 speed trans vs 5

Visually not much of a difference. Like others said above, the speedo is different, but nothing that would really stand out while driving by one. Even the dual exhaust wouldn't be a determinating factor since many 2010 V6s have added dual exhaust after the fact.

ah crap it sucks i cant even pick on sixxers anymore.

I noticed the difference in the chin spoiler the other day while I was the dealership having my oil changed. The 2011 has a little more pronounced chin nad yes there is also the subtle difference in the tail lamps.