I see a lot of M3's around my area using the Yoko's. They seem to like them. My friend with a Focus also uses these tires for autox and track events. He has had really good luck getting them to last for a long time. The only thing he complained about was it took him about 5 events before they really got sticky. There's a lot of tread on the Yoko's.
I'd have to say if you're doing a mix of track events and autox then go with the Yoko's. Otherwise if it is just autox go with the Kuhmo's.
As far as which Kuhmo's to go with, I'd have to say stay with the Victoracers. They are proven to last a long time and hold really well. You can also run them backwards. They are marked as a directional tire, but I've talked to a lot of people that say it doesn't make a difference on the Victoracers. So basically run them to the wear bars on one side and then have them remounted and run them to the wearbars on the other side. Just my 2c's.
