According to Dunlop, the non-lexus version of the SP9000 Sports are NOT recommended for use on the IS200 as it upsets the handling.
The differences between the Lexus and non Lexus versions are....
1. Lexus version is made in Japan, non is made in Germany
2. Lexus version has Lexus on the tyre sticker - check before fitting!
3. Lexus version has stiffer tyre walls
4. Lexus version has different tyre compound - the tread wear rating is AA rather than A.
Micheldever tyres in Hampshire do them for about £90-£100 as do Headley Tyres near Newbury. Make sure the tyre dealer is 100% sure they are the Lexus ones, as most don't know the difference and may even have to order them.
If they are havingn difficulty getting them, call Dunlop support and mention it, as they say they will supply dealers quickly if they know they have customers waiting. Otherwise large dealers order up loads of stock to be stuck on shelves!!
Also, the new Dunlops, SP Sport Maxx or whatever, about 4 months ago, Dunlop were still recommending using the SP9000 Sports for the the Lexus. Shame, cos the new ones are supposed to be really good.
I find the Dunlops to be excellent for tyre wear and pretty good too for grip, though the bridgestones are quieter.
Hope this helps you all, feel free someone to add Dunlop tyre details to Knowledge base if you want.