OP...check the make of radiator and ET if you can...I really don't think you ought to be sanding down the radiator neck as I'd be concerned that you wouldn't get a good seal afterwards.
Usually with things like this, you'd figure it out 5 mins. after you give up.
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Mangofy your E46!
Last edited by dmax; 01-09-2013 at 06:48 PM.