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Originally Posted by Lux
Before going to GIAC, you should get your a/f measured. And not with the sensor that goes in the tailpipe as that is not very accurate. You'll have to drill into your headers pre-cat and attach the sensor there. Afterall, if your a/f looks fine, then the issue is with the intake. If your a/f is out of whack, then at least you know you need the GIAC.
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That's something to consider. My Dansk manifold already has a pre-drilled hole for the factory O2 sensor that came with 2002 and above cars. That'll save me the trouble of drilling and welding.
Anyway, my local mechanic has suggested that perhaps, the supplied K&N filter is too small and may be a reason for a lower bhp reading. Basically, smaller surface area for intake will result in less air. I'm going to remove the filter next week and replace it with a VERY fine wire mesh over the intake tube. Go for dyno and see the results. If the dyno reading is higher, then his theory will be right.
And by the way, I made sure during dyno, the intake temp was normalised to about 45 deg C in both before/after runs... So that removes the air temp factor during the run.