Just some quick comments about the engines used at the worlds. The Sirio engines that powered Josh's car for the TQ as well as Collari and most of the other Sirio powered drivers in the finals were the Collari Modified Sirio's. These are available on a limited basis and can be bought in the stores. As a matter of fact Darrin Ishitani used this engine to TQ the McCoy and beat the lap record by 1/2 a second. Look at the pictures of the cars but if you see gold heads on the Sirio engines then you know that they are Collari Modified.