exhaust mani to cat bolt loose and rounded.

[PBCup]

Got a rattle at 3500 on my 172. Found that one of the bolts is loose that joins the mani and cat. I tried to sort it but the nut was rounded from someone probably using mole grips.

Any advice on best way to sort it as it looks very difficult to grind it off.

Thanks

 

[mr.pink87]

Dremel it off and use a new genuine fitting kit.

 

[MicKPM]

Grinder with a cutting disc straight thru the exposed bolt section at the joint then as above, replace with genuine fitting kit.