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Ok, so I found out that primary cats are must have, but secondaries are not MUST haves to pass emission test in Ontario. So given that new (for me) info - I'm confused: does deleting secondary cats increase, decrease or do nothing in terms of power gain? Searched on forum and some say it steals away 5-10 hp, others say it adds 5-9hp and many say it basically does nothing in terms of gain since they are not at all restrictive (unlike primary cats). Not sure who is right. Educate me please guys?
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