I really liked my DWS'. I never got flat spots in them, but the car never sat for very long. Supposedly flat spots from sitting go away after a few heat cycles, and is more common with summer tires. I let my E30 sit too long this summer (about two months), and the tires have some flat spots that I haven't been able to beat, but I haven't really had to opportunity to get some serious heat in them.

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03 3.0i mt
89 325is