Those are not an upgrade. Thats just another marketing lie Mercedes$ource uses to screw money out of their customers, and as usual, about $100 too expensive.
Balancing to +/-3 bar is a lot. A good rebuilder will set them within +/-1bar.
This is the only good part of the ad-
Quote:
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Cores that are rusty or have been running vegetable oil will only receive a $35.00 refund.
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