Make sure they use the OEM style top gasket or your windshield will make noise.

Also, unless you have time/transport, I would not have it done at the shop because it will have to sit for at least an hour after install (I always thought this was so the WS would not leak water/air. It is actually so the WS will not pop out when you hit the brakes hard). And 4 hours is a real ripoff because all the times I have had mine done, it took no more than 20 minutes.

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2006 X5 Sport 4.4i