I am trying to get my parts lined up tonight for repairs tomorrow but I don't have the Max here to look at.

Are the bolts that hold the cat to the front pipe, the O2 pipe to the cat, and the rear pipe to the O2 pipe all standard 8mm metric? Do I need nuts? Bolt length maybe 30mm or ?

Thanks,

 

M10x1.25 and might as well get matching nuts too.

I'd say 35mm bolts to be safe.

 

Updating this since I finally got in there... They are standard 10mm studs on the cat.

They sure looked like 8mm, but mine were just so rusty that they were down to that size. The nuts were corroded down to 12mm across from the staring size of maybe 14mm. They were welded on by the rust, so I had to cut them off.

The studs were not coming out - at least not without a really big torch I don't own. So, I ended up drilling them out and replacing with stainless bolts and nuts. Slightly less convenient to install, but gets the job done and the will come out next time.