just had mine done in the garage €260 , the mechanic said he put bolts or screws in the holes with a lock tight glue so they dont get work loose and get into the engine , runs better now than ever and better fule economy !!
thanks do you know what size bolts he used i am looking at going in from the under side of the manifold and linking them together with locking wire have even thought about leaving enough protuding to enable a split pin to be placed in through the other side as the last thing i want is a bolt inthe inlet ports