Tabushi I have heard the Jp3 is probably the best jammin pipe on the Go engines but it does not perform as well as a 086 or 2047.

Free2day, the sport engines do not include the extra shim because they don't have as muchpinch as the race engines so its not necessary.

Pooldoc, After 4 gallons it probably wouldn't hurt to remove the .1mm shim but remember its faster and more consistant to have a engine that is a little slower and easier to tune then one that is faster and a little more finicky.

Vti-Chris The 3port race engines will all be new batch engines and will inlcude a 3 shims with a total of .4mm shim width, I was told by the factory that the pinch is not as tight on these engines so if there is a shim in the box it shouldn't be necessary. It shouldn't come with plugs because Go doesn't make a turbo plug. It is set for 30% nitro. You break in procedure sounds fine but I would leave the head wrapped in foil until your completely thru the process. Since your fuel has a low oil content it would be best to keep the engine on the rich side for the entire process.