I recently sent my TB racehead to Ray at RJP Racing to have my head ported. He ported the head to increase my topend for my TB108 motard bike. I really did not think that porting the head would make that big of a difference, but it did. I felt a big difference right off the bat, the bike pulled harder out of the turns and was noticeably faster down the straight. Porting the TB racehead really brought the motor to life compared to the unported head. If you have a TB racehead or any other head, I recomend having it ported by Ray at RJP Racing.