Just an update from my last post.
I have spent 2 weekends at the track with the P3XB. I have tried a 2169 FX pipe, and a 2013 Werks pipe. The 2013 for me is the better of the 2. I also had better tuning using an OS P4, P3 to me was to hot. These are my findings.

1. The motor is very tight. It will be every bit of 1 gallon before really run in.
2. Holds a good tune, idles great.
3. Mileage nothing to brag about. 8-8.5 minutes at the current time. I feel it will get better as the motor fully breaks in.
4. The engine does leave more to be desired on the track. To me it doesnt have enough immediate bottom, nor does it have good legs for a big track. But it will get you around the track.
5. This would be a good small track club motor. Or good for someone just getting started.

I am not disappointed in the purchase. This was 169.99 engine.