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hey guys have currently a 3" cat back (hks), with xforce dumps and ypipe. cat is stock looking

have now bought a 4" cat back with muffler and canon (neat job)

i am wondering thoughts on if i should run a 31/2"inch cat (3inch outlets) and then into 4nch cat back?

or will this lose its flow

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https://www.sau.com.au/forums/topic/406113-exhaust-upgrade-4-helpinfo-please/
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