Why don't we leave the slick/canti debate for another day....
I believe Trekkor's initial inquiry was about Toyo, yoko, hoosier, kumho DOT Rs.
He couldn't fit cantis under his current fenders. Doesn't even look like 225s will fit on the rear of his car in it's current configuration.
Trek,
My good friend Jeff Reitmeir and his co-driver Jim Lane in the 924S, used Toyos last season and they both said they were junk for their application.
They went back to Kumhos this season for practice and I believe they have a set of Hoosiers for Timed Runs. They both agreed that they worked well in the rain and lasted a long time, but for ultimate grip they were nothing special. I think Jeff knows a thing or two about good vs. fair vs. junk tires, for AX and TT.
Just because the Toyos are the spec tire for a couple of groups like spec Miata or 911 cup, does not mean they are a great tire....just means those guys have to use them and they are getting a bit of a discount at purchase time.
remember you are still in a steep learning curve on the track.
Get a particular tire and stick with it the entire season. Constantly switching tires does not let you learn the progression you are making. "Is it the tires or is it me?"
With your car you should be able to get a set of what ever manufacturer's tires and run a good portion of the season. If not then, either your car setup or driving technique needs to be attended to.
My $.02
Dan's paragraph, "Remember..." is simply a great piece of advice Trekkor. Follow it and you'll become a better driver.