How to tell 180 vs. 225 HP models?

I'm in the market for a TT Coupe, and I'm having trouble determining if a particular car is a 180 vs. 225 HP model. I know the 225HP model will always be a quattro, and that the 225HP model came with 17" wheels. I've also found that the 180HP model came with 16" wheels and that quattro was optional. Then I found some info which seemed to indicate that the 180 would have a five speed while the 225 has a 6 speed, but the article was somewhat ambiguous. But I've found a red quattro with 17" wheels and a five speed. I don't want to rely on asking the seller because I'm not going to buy a car based only on what they tell me. How can I tell which HP engine is in a particular car?

A 180 Has One Exhaust Pipe And A 225 Has Two, One Either Side. And The 180 Can Have A 6 Speed Box.

Oh thanks. I did not know that too.