Just a heads up if you're going to replace them, guys - these puppies are $7.25 each at BMW and you need 16 of them if you replace them all. You might be able to find them cheaper online someplace, but I had my intake off this weekend and decided to replace them while I was at it, and just ran down to the dealer to buy them. Not a trivial amount for a damn O-ring...
wow...they're $3.25 online.
thanks for the heads up.
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