Don't know about either of those, but (and I don't know if they qualify), have you checked out the Toyo R888s? Best tire I've ever driven, short of a Dunlop slick.
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T1R's are great for a street tire, I had them on my M3. The sidewall is a little soft for a track tire I thought. The RA1' s are an awesome track tire. For either one of them you will have to go with 18" sizes though.
Dave
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Current ride: To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. 2007 997S coupe SY, Blk sport seats, Nav, Bose and alum. door sills..that's it.