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No such thing as quiet with headers lmao. You will fall to lead foot syndrome after 5 mins with it on.
I have Kooks LT headers on my car with NPP exhaust and have both offroad and cats to swap out for emissions testing, I know **** me right? stupid Canada.
At Idle you wont notice much of a sound difference loudness wise IMO between the two catless is slightly raspier if I had to give an explanation? But it will definitely be louder on startup and slightly more on idle
Biggest difference is smell .. BIG time, but you get use to it. HP between both, thats negligible, MAYBE if you're lucky 1-3HP it makes no noticeable difference.
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