Yeah, Tom; on two recent occasions I bought from Tire Rack and had them shipped to one of their local recommended installers. Price and service were both excellent, and it's likely that all my future tire buys will be handled that way.

One thing to check in comparing installation prices is to see if lifetime(of the tires, not you)balancing and rotation is included.

It appears that NS Performance would be a good outfit for putting the DWSs or whatever on a Mercedes.

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Enjoy the music, not the equipment.