So I'm getting ready to replace the OEM cat with a Berk HFC and I'm curious as to what applications warrant the use of anti-seize vs threadlocker. I know threadlocker is typically used where there is extreme vibrations and to prevent galvanic corrosion and anti-seize is mainly for dissimilar metals and high-temperature applications.

I imagine the bolts for the HFC would be under extreme vibrations as well as fitting the bill for a high-temp application. In this case, I assume anti-seize would work better but can that cause the bolts to loosen up over time due to vibration?

 

I think I went with anti seize because it comes on the O2 sensors but who knows if that's right. Just my .02 cents.

 

Don't think there is any threadlocker that handles the heat around that area.
Use antiseize and serrated flange nuts, or regular nuts with nord-lock or spring washers.

 

The cat will come with new lock nuts and bolts. Just tighten them. To spec. I used new Honda spring bolts at the header.

-- Chuck

 

I use copper anti-seize on all of the bolts and 02 sensors around the header and cat and exhaust. It might help with future removal.