Uprated, do they need it?

Just uprated bearings, gearkits etc what do you have in yours?

Mine runs up to 36psi on a GT30 and the current standard T5 box is absolutely fine and changes up and down lovely but i know they don't last for ever when abused.

I'd be interested in any info regarding straight cut gearkits and are they available through the States cheaper etc as i've been looking.

feel free to add any info