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Message: <blockquote data-quote="2wenty6" data-source="post: 505257" data-attributes="member: 20205">The cat is there to reduce harmful emissions. If you changed your stock cat to a higher flow one, you will theoretically gain more power/torque. Just like how changing to a 'sport' exhaust yield better performance simply because the system is flowing better now.EDIT: without cats, your exhaust gasses will smell stronger but I don't see why that would be a problem (environmental concerns aside <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />) It does not smell REALLY bad la..pretty much like how it smells on cold starts in the morning.</blockquote>