Quote:
Originally Posted by roy'sz
It is normal...car leans out. Need tune or revert back to stock cats. Simple as that. Check my sig for dyno tu e at stillen.
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99.9999% chance the CEL has to do with catalyst efficiency below threshold or something. NOTHING to do with too lean. If it was running lean, it would throw a code for that and the dealer would've said something more than put the stock cats back on