So I bought a MM 2 in to 1 exhaust. Tried fitting at the weekend. it was all going well until I tried to remove the two allen bolts on the guard for the O2 sensor. I've completely stripped the allen bolts. I've applied penetrating oil and left for several days, I've applied heat, I've cut a line down the centre of the bolts so I can use a flat head screwdriver, I've even tried swearing at it (extensively).

I've got to the point now that I'm thinking about just sawing the heads of the bolts off and removing the guard using a bit of brute force. My thinking is that once I have the guard off I can just purchase some new bolts to attach to my new MM system. To be honest I may have to replace the bolts anyway considering the mess I have made of them.


So my questions are...

Am I barking up the wrong tree with my plan of sawing the heads off the bolts?

Does anyone know what size and type of screw I should be using to replace the old?


(Disclaimer: I am a complete novice and I may need things spelling out)


Thanks in advance!