If you take a look to this TT you will see no changes externally. The biggest changes are under the hood. HPA Motorsports used 2 turbines and boosted the 3.2 liter engine from 250 to 550 hp.

The HPA Motorsports features 19″ BBS rims and the "lambo doors". Its orange paint makes it look even sporty. Finally, the TT has become a true sports car. But, yes, true, is not a Ferrari or a Lamborghini.