So far I am pretty impressed with the B5 also. I have raced mine one day and am still breaking in a little bit, so I wasn't a mad man on the needles

I am running the motor in a Mugen MBX6 with 1.0 springs on Mugen Aluminums, a 14 tooth bell and the 2013 pipe and header. I was getting about 9:30 minutes runtime on an indoor track. This week I will be moving to the Werks 30% fuel for the first time. I can't wait to let the motor eat. I will also be breaking in my friends B5 for use in a Losi truggy, so I will let you guys know how that goes. If anyone racing at HCRC in Danville Indiana this weekend wants to see one of these motors in action just find me.
Thanks
Adam Kasch