GKTECH Shortshifter - First impressions (Smooth shifting, clicks into every gear and no looseness, not too short or notchy) Yet to drive, so can't speak on drivability yet or possible vibration :
For Sale - GKTech Short Shifter for S13/14 | Driftworks Forum
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IRP - Short shifter 350Z/Z33/G35 V3 (IRPSS350-3) – Drift HQ
GKTECH - RB25 Short Shifter Install | Check it out, we've got another install video! This week we have our RB25 and RB26 short shifters! We've always made SR20 5 speed shifters