I am not sure what the level of tolerance for boring the D17 has. I know that my B16 can only take an overbore of about 1mm at the very max on a stock sleeve. I would not really want to take it to that even. I'm sure someone can give you a tip on the 7th gen's capabilities to take an overbore. I would say doing a .030 over bore would be good b/c you can have the bore trued back up and honed which will take out any imperfections and make complete ring seal much more likely.
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