And if you've swapped rims and/or tires? What then? Nothing says you can't put 16's on a base model (they came with 15's on the 1st Gen's). Or what if you have 16's? On 1st Gens, that would make it an XE/SE. But on 2nd Gen's it would make it an S, I believe as the XE/SE's have 17's (stock).

Or to quote, "I have a rocket launcher. Your logic is invalid!"

The only FOR SURE way is to check the VIN.

But there are other methods, as mentioned (badging, engine size, etc.)

And no, never heard of a 3.6 in an X. Not stock anyway...

-G