Suitable Gearbox upgrade

When the Silvia is tuned, I have no doubt that I will be blowing boxes so I need to see what we have available in our land of the wild.

Anyone have uprated internals for the SR box (OS giken, etc) or a bigger box upgrade with conversions parts (rb25 with prop and adapter plate, etc)?

Thanks
Dylan

350z 6 speed with adaptor plate heard best for drifting

Yeah and they are really nice boxes, may look into that