Can anyone tell me the cosmetic differences? I think I heard there is a vented front air dam or something, but can someone tell me for sure, maybe a pic or something? Thanks.

i think the front and rear tires are different size, yes thier air dams in the front bumper. the tt has a wing. and the engine model is VG30DETT and the the non-turbo i belieave is VG30D or VG30DE. i heard the tt has the twin turbo written on the engine i would guess the vaule cover and on the back of the car. umm i guess thats it. i fi am wrong sorry i am just tring to help.

-Chris

Twin Turbo:
engine VG30DETT (twin garret t2/2.5 turbochargers)
EXTERIOR DIFFERENCES:
The Twin Turbo has different wheels sizes on the rear and front tyres, while the normally aspirated has both the same size:
Twin Turbo:,
Front 7.5j, 16 inches diameter cast aluminum alloy with 225/50zr16 tyres
Rear 8.5j, 16 inches diameter cast aluminum alloy with 245/45zr16 tyres
(the normally aspirated has 7.5j, 16 inches diameter cast aluminum alloy with 225/50vr tyres front and rear)
Weight Twin Turbo 3,414lb manual, 3,495 lb auto, (the normally aspirated has 3,219lb manual, 3,313 lb auto)
Normally aspirated has shallower front air dam, and lacks the tail spoiler. The Twin Turbo is 8.5 inches shorter than the normally aspirated, which is 2+2. The fuel filler position in the two seater (twin turbo) has the filler flap ahead of the rear wheel, the 2+2(normally aspirated) location is behind the rear wheel.
and of course, the Twin Turbo says Twin turbo on tbe back, on the left side, bellow the rear spoiler

Wow. Impressive percision on the info. Thanks.