Quote:
Originally Posted by TiAgX5
I would not replace these with anything but the fastener specified by BMW. A different grade bolt will not deform the same as the OE bolt, what would the correct torque be for the new fastener? 
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For the torque, I use what is listed for that size/grade of bolt. Many charts float around on inet. I don't really think a TTY is mandatory for that part, but I may be wrong. Sometimes TTY are used to deal with vibration, movement instead of lock washers or lock nuts.
Edit: ...and yes, I used non-strech bolts and new nuts (high grade)