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Originally Posted by BAN SUVS
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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4-pots on a 2.0L WRX is probably next to zero weight difference. It's only the unsprung weight of the larger calipers (which is probable what, maybe a pound per wheel?) and zero change in rotational weight because the rotors are exactly the same.