I put them in a straight run area.. about 6"
after the end of the primaries.. if yu were
running open headers I want 8"-10" before the
end of the collector.. that way it wont back
flow and pick up out side air which could give
you bogus readings on shut down or a steady rpm..
make sure the sensor is pointed a little downward
(on the inside) the drop off moisture when its
cooling... try not to put it near the X.. being that
just pulses back and forth