Some News:
I just replaced my rear PMU brake rotors with Dixcel HS rotors and Type Z pads. Breaking power is just perfect with my Spirit R front calipers and definitely, Dixcel products are great!
I also installed my new SLICK camcorder clamp on my rear tower bar, it fits perfectly and I can't wait to go driving on the Fuji Speedway!
Next mod will be a Okuyama Rollcage and some new Bridgestone RE11-S tires. I won't change a lot of other things from there...