02-03-17, 09:07 AM
Headers off there I would think.
Just as I suspected, there were a few headers which did not last long on the market because of the issue you have. Many 400s came from Japan with headers like those.
Look around for a good second hand replacement, it is a pain having to remove them every time you need to change the filter.

Look around for a good second hand replacement, it is a pain having to remove them every time you need to change the filter.