Success! Managed to get them drilled out after I went and grabbed some cobalt bits. Only caught one piece of molten metal in my face causing a lower eye lid blister. Traded safety glasses for goggles and finished the mission.
Ran out of threads on the bolts between resonator and catback connection, but no leak detected at either end of race pipe when sprayed with soapy water. Pulled exhaust all over and couldn't get it to hit heat shield or cause leak. Loaded updated tune from Freektune and will run logs in a few days.
Done with power mods until I decides if I want to go BNR and DP at a later date.