I've been noticing my 4th gear (6-Speed Evo IX GSR) is a bit notchy at high rpm.I've had my competition stage 3 clutch for long now and my car's power is up now recently with the addition of a GReddy O2 housing,new turbo and new 27 Psi tune.

So I don't know if it could be the clutch that's going,and if it is would it be doing this in one gear only?

Or should i check out my shifter bushings,because mine are still stock.All other gears are fine.