Hey Dan-O, it sez in Pato's vid that he's using the STS D21T. I was actually going to buy one of these prior to the start of the race season before I made my fateful Collari mistake. However, I was going to buy the original version (D21B). You can get them either at
www.projectzen.net or
www.racernine.com. I just checked the prices and noticed the D21B has dropped to 130$ and the D21T has dropped to 175$! Sweet deals considering all the praise the STS engines get in the nitro engine forum.