New brake pads today. I won't make it to many track days until Spring, so I'm going with a less aggressive pad. The Mountune track pads work very well on-track, but they are driving me nuts on the road
I also bought, and ran, an Ozone Generator in it last week. Works very well. Leaves it odorless, in an odd sort of way.
In a completely separate vein, I had a Numeric Shifter and Shifter cables installed in my GT4. Unbelievable difference.