I had the following combinations with berk test pipes (non-resonated)
Stillen exhaust= Horrible rasp inside & outside the cabin. Possibly the worst sounding combination I have ever heard.
Stock exhaust= Rasp in the cabin, not so much outside the cabin while driving. Sound was basically stock but louder.
Stillen y-pipe and stock exhaust= Horrible rasp. Inside the cabin was torture to say the least. Sound outside the cabin was stock but a LOT louder.
Top-Speed Pro-1 True Dual= My current setup now. Inside the cabin you can hear the test pipes hiss around 2.5k RPM up to about 4k (which is when the exhaust is just so loud you can't hear anything). It is crazy loud inside and outside the cabin. The sound is awesome though. Hoping when I finally find a shop to tune my Z that the hissing will go away.
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'08 350z Enthusiast
'10 370z 40th Anniversary
'19 370z Nismo Tech
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