The only way to know for sure is by the VIN. If you like the car otherwise..there is nothing wrong with a base. If you are buying a car strictly for the purpose of track racing....then I would personally stay away from anything that is not a TT....other than that IMHO.....it really doesn't matter. If you test drive it and you like it and the price is right..buy it. You will have a great looking and riding car that is for the most part VERY reliable (I've never had any problems with either of my 3s's) and fun to drive.