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I ended up using secondary o2 port as my cats are deleted. Location is perfect if you're running no cats, otherwise you'll need to weld in a bung before the cats. Factory o2's do a good job for idle and partial throttle tuning so wouldn't remove the first set of o2's, only secondaries. I guess it would be possible to remove primaries once your at the WOT tuning and have partial/idle dialed in, then once WOT is done, put them back. But then you won't have a permanent AFR gauge to monitor if you're into that
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