Nta01 the 3port engines are not available yet, I have recieved good word from my drivers and have placed a order with the factory, So it shouldn't be much longer. If you wish to purchase engines locally in arizona, you can go by hobby action in tempe, Papago R/C raceway, and poorboyracing.net. all of those locations are authorized Go dealers and if they don't have engines in stock they can get any engine within 1-2 days. Early reports of the 3port race say smoother bottom then the 5port with slightly more top end.

Swede#1 Grizz is right run your stock shims the turbo button and standard are the same. Sorry for the confusion.