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EGR tap in the exhaust pipe NOT the manifold
why do you not
tap into the exhaust pipe , AFTER the cat converter
there would be less 02 so the EGR gases would be more INert then the gases at the manifold and
due to a longer length of un insulated connecting tubing
the gases after the cat would be cooler which will reduce combustion temperatures and NOX better than the hotter gases at the manifold .
and
it is relatively easy to weld a bung on the exhaust pipe .
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