Just testing the water here really
We are able to supply some very tasty final drive gear kits (for fitting into your diff) in 1:4.5 which is much shorter than the standard nissan 3.6 or 3.9 200SX ones
Obviously, it's going to limit your top speed a fair bit, but that will be in return for some fairly significant acceleration improvements across the rest of the board and less stress on your gearbox components
Is this something people would be interested in?