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      09-06-2012, 01:07 PM   #27
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Drives: 2007 335Xi
Join Date: Apr 2011
Location: Kenmore, WA

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Originally Posted by serotoninsteve View Post
The same happened to me, I did drill mine out without removing them, but they are a bitch. As hardened steel.
Normal drills will not last, you best need something like a tungsten drill. I used a lot of normal 6mm drills and it took me about 5hours.
Then I bought a tungsten 6mm mill and could grind them out as you see in the pic.
Thanks Steve - very helpful! I'd really like to avoid removing the downpipes - and had tried drilling to no avail. The tungsten option sounds good - but can you provide some more detail (or a photo?) of the bit you used to grind out the hardened steel stud?
I have already ground off the studs flush with the flange, and even the back of the stud also flush so I am ready to drill
2007 E90 335xi
Cobb AccessPort, BMW Performance Exhaust