I think the twin-pipe is the exhaust of interest. I have the stock US spec
MK IV manifold and single pipe with three studs, and that joint has never
given me the least bit of trouble as long as I can remember.
Doug
>Admittedly, Ed didn't specify what car he was referring to, but I'll assume it
>was the Herald as per his .sig line.
>
>Seems to me that a lock washer ought to work as well as anything in most such
>applications (although perhaps NOT on the UK-spec twin-pipe manifold, where
>apparently nothing works!), seeing as that is what was originally called for.
>I'd be leery of the all-metal self-locking nuts, as some of them tend to be
>pretty brutal on whatever bolt or stud they're used on.
>
>--Andy Mace
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