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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,630
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A few years ago the exhaust manifold of my IO-550 started bulging in that same area.
Glad we found it during the annual inspection vs. while in the air.
I considered switching to headers at that time, but my mechanic discouraged that.
No real performance gains (550 provides plenty of oomph), more heat in the engine compartment, and more difficult future maintenance with the extra space needed for the headers.
We installed a new stock manifold and lived happily ever after.
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