If the exhaust is significantly less restrictive, the bike won’t adapt. Penner’s map removes the restrictions in wide open throttle and makes changes in mid range fueling and ignition.You could use Penner’s map based on 31013 if you’re not worried about using a map for N America. These maps may have more stuff in them than you can see in the tables. I would copy every table from Penner’s map into 31012.
Since Penner’s map isn’t optimized for your exhaust, you may want to get it on a dyno to check it. You can install a PCV and have the fuel tuned with Penner’s map in the ECU.