The B4 tower idea was mine. I'm proud to say it was the genesis of the design of the new X-Factory tower. I did it for a couple reasons. One was so I could have more tuning options. We (my son Alex is the racer) could run either a T4 tower which was equivalent to the X-6 tower with regard to upper shock hole positions, or the B4 tower which was narrower. Here is a pic of the B4 tower on Alex's X-6.
We then went to a carbon tower that was much narrower than even the B4 tower. Handling for our track got even better.
The week we had it finished, we met up with Kinwald and found that the inner holes on his carbon tower were the same as ours. Great minds think alike, I guess.
Here is a progression of my tower widths. The top is the factory tower. Second down is the B4 tower, and third down is my new carbon tower.
The difference in the stock tower vs the B4 tower is actually a little more than it looks in the pic.
It is fun playing with new designs and seeing how they work
Chris