9" or 12 bolt for M6
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but I still say it's a valid discussion topic. I hope we don't become "use the search *****" 
The Ford 9" loss of power, size (big) and potential loss of abs..
My say, if you are a hardcore drag racer and making over 600 rwhp get the Ford. If not buy a 12-bolt in pieces with the parts you want, and assemble it yourself or have a competent tech do it.
But as keliente said, personal choice..
Good luck
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