Installed Stillen short shift kit. Love it. So much better. No more slop. I definitely wouldn't go back. I had to get a new knob, of course. The factory uses Loctite.
I had a Sprint Booster on an 06 Cayman with MT. I really liked it. I would stall, taking off from a stop sometimes, before I installed it. Never had that problem once I put it in. I had a 2012 Porsche, again with a manual, but it came with a "sport" button. That button did what the sprint...