What can I use to stop the transmission fork from flexing when alot of torque is....

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What can I use to stop the transmission fork from flexing when alot of torque is applied?

I'm looking at the kafer cup brace, the one thats on the tech article on this site, but i'm not sure if thats only good with the stock tranny, or if you can use it with a bus tranny (I plan on upgrading later on)