Sound deadening is a band-aid for "too much noise created in the first place".
I have an HKS Hi-Power catback. It uses Helmholtz resonators to suppress the drone frequency (there is ZERO drone). It is very quiet and docile in the cabin at low RPM / light throttle loads (very close to the stock exhaust) but it comes alive significantly when you put your foot down and has a very rich, harmonious roar to it. It's louder outside the car than from inside the cabin, for sure. If you drive it gently you will forget you have an aftermarket exhaust, it's that good.
Stock Z, no additional sound deadening and I HATE overly noisy exhausts. HKS have done some brilliant engineering for this one.
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