I have Kumho Ecsta XS tires on my M3. They took a long time to break in and start gripping.. they take heat and abuse well, but take longer than many tires to heat up in our cooler weather. Just keep that in mind if you're ever driving on them.
I liked the videos, I don?t know who this guy is tho.. But I don?t agree Porsches don?t make any engine sound when idling, my Boxsters engine was about 15 cm behind my ears and the only thing separating us was a thin metal plate and a carpet. You love that sound, untill it drives you mad/ deaf..