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What organization do you run AutoX with? That will have some bearing on what you do.
The BMWCCA points system will treat you pretty fairly, but most everyone else uses SCCA classes and installing the shims moves you from Street to Street Prepared. The wheel diameter change is OK so long as you stick with stock widths and keep within +/- 7 mm of OEM offset.
Do the 17's actually clear the front calipers on the M?
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