Borla catback bolt size

I just purchased a 2002 ws6. It came with a borla catback that was installed prior to 2005. I wanted to check to see if a plate was installed and remove it if it was, to make it a little louder. I’m pretty sure the bolts are going to snap since they have been on there for over 15 years. Can anyone tell me what bolts I should get ahead of time to replace them if snapped? Here’s a pic. https://uploads.tapatalk-cdn.com/202...caadc8aac1.jpg


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I would just cut them out with a good cut off wheel between the flanges, and plan to replace the gasket if any. Then I would take whatever bolt you can get a diameter of, go to your local hardware/Lowes/Home Depot and replace with stainless steel hardware of the same thickness. If I was to guess, it could be a 15mm hex head bolt with a M12 thread, 20mm or 25mm long, 1/2" thick.