Honestly, having run Subaru 4 pots, it's not a real big help for autocross. The weight more than cancels out the larger pad surface IMO. If you plan to track the car much it would be worth it though for sure. And like Dean said, it will be legal until/if the line in Appendix A is changed. Then you would have to go to SM or take off the calipers.
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FWD is the new AWD
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