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A sport exhaust... whether it be a full cat back system or an axle back... will not cause a CEL.
That being said... a sport exhaust will net you zero gains, performance wise. It will improve the almost non existent tone of the N20/N26.
A catless downpipe has the ability to increase performance but WILL give you a CEL unless you have a specific flash tune that can turn off "cat monitoring."
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