Quote:
Originally Posted by Scottyz
Will deleting the the secondary cats turn the engine light on?
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It shouldn’t, as they are not monitored. Modifying anything without tuning is always a gamble, though.
And definitely don’t do headers without tuning. It actually won’t run lean or be dangerous at all (confirmed no change in AFR on my car), but you will likely get a check engine light that will be a bitch to get rid of — even if you decide to tune it later.