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I did mine today, a 335xi E90. Not a bad job, probably an hour total of monkeying around. You need the following to get at the bleed valve: a 8-10 inch ext (1/4" Drive) a 1/4" drive knuckle and an 11mm 1/4 drive socket. I agree that you need to leave the body of the CDV in, you can just push on the orifice in the inside with a screwdriver or drill bit (slight tap may help) and the guts fall right out. It does make a difference in changing gears. I particularly notice the 2-3 and 3-4 shifts are much smoother and also the double jerk that sometimes occured from 1-2 seems to be gone. I would recommend this mod to anyone thinking about it.
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