There are two different B7 engines, the B5 and the B7-Pro. I'm assuming that you are asking about the B7-Pro. The B7-Pro is a full blown racing engne, lightened and epoxy filled crank with tungstene counter weights, ceramic bearing etc. etc. etc. Now comparing the two the B7-Pro has less bottom end but more mid and top end for days. I highly doubt that you will tnx a faster engine when it comes to mid/top. This engine is ideal for large flowing tracks or for more Euro style off-road tracks. Hope this helps, let me know if you have any other questions.

Regards,

Ron