Do you have the D16 or B16 Vtec motor?
Either way, have you considered gear/transmission swaps?
There are taller B-series gears that will fit in the B16's YS1 case easily, including longer final drive sets and a taller 5th gear from non-Vtec Integras.
There are also (obviously) a plethora of great gear swaps that could be performed on the D-series transmissions as well.
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