What other performance cars do you own?

[clubhead]

Originally Posted by Adam

...if you want to retain the stock engine this will give you max gains. Not for the faint of heart. 390 hp on stock internals or 450hp if you want to go all the way.
http://www.t-t-p.de/english/986.php

Anyone knows anyone who has gone down the ttp route? Cost of the 450bhp upgrade is almost like buying another Boxster though....