Recently I heard a rattle in my exhaust, so I decided to investigate by removing the exup valve and seeing what was in there. After doing some research later I found out that some FZ's after awhile will develop a rattle from the small bushing/washer located on the exup valve. Well through the process of removing the cover, I snapped two bolts holding the cover on flush with the exhaust. I used very little torque and they just decided to snap (again, heard this was common.) I thought well, drilling these out shouldn't be an issue, boy was I wrong. I can only drill out maybe a quarter of an inch and now I cant go any farther. I've gone through 4 bits to see if they were the problem and even tried a Dewalt Cobalt bit and still can't drill through that bad boy. If I could just get it a little farther to tap I would be good, but I've ran into a brick wall it seems like. Does anyone have any ideas how I can drill any farther into this bolt so I can get a heli-coil or something in there? I've completely ran out of ideas and patience.