The cusco extractor should be in 4-1, and got a ball on the bottom, cusco mark on it, well, quiet nice price, althought it fit to supercharger, actually it do fit to 16v, if 20v have to mod a bit to fit it in.
Lately, I've been experiencing quite serious vibration when engaging 1st gear - I got to step on more gas before releasing my clutch to solve this problem.