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Hi I was interested to see if anyone has experience with Axel back vs Catback vs stock exhuast systems for a 8th gen Civic SI. I haven’t really been able to find any YouTube videos or threads on this. Basically I don’t really care about getting an extra 5-10hp from a cat back I really more want like 20% louder exhaust noise just for fun essentially. I already have a aftermarket intake which I don’t believe the car is really tuned on so I don’t want to make the air/fuel ratio even more wacky by adding a cat back so I’m curious if any one uses a axel back to make the car louder? I hope it’s like atleast 20% louder depending on which brand of axel back Ofc. But yea I’d much rather go with a Axel back but I am unsure if is even worth it or much louder at all then stock? Let me know! Thanks