Paul, it appears that the upper housing is the home made port?
 > I can still see the water  port on the outside of the housing.
 > It also appears that the exhaust port has been enlarged some as well.
 > Royce

 Lynn??? Which is which?

    The lower housing is the stock factory housing

    Lynn E. Hanover

Snip

         Lynn,

      Is it just the angle of the photo or is the factory
housing a 12A? It appears to be narrower. Also it appears
that both housings use no inserts in the exhaust ports.
      Do the exhaust ports show erosion after extended use
in a race car? Would you recommend removing inserts for an
aircraft installation?

        Kelly Troyer

 
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