Black is the best color!
I totally agree with you on the shifting improvement over the Rex. I drove a STI about a year after I got my car and was amazed. Since I couldn't afford a new STI, I put in Group N motor and trans. mounts, and a Cobb short throw shifter with Perrin bushings. It made a huge improvement.
I'm curious about your clutch engagement point also, do these cars have an adjustable clutch cable?
The shutter doesn't sound right, is it possible there is an aftermarket clutch in there? I've heard the STI's are pretty hard on clutchs. Maybe it's time to change it out?
2005 WRX Cobb Stage 2