N54 FBO exhaust gains

Hey guys, yes I searched and no real answers.. Feadback or numbers...
I have a fbo 335I 6sp with meth (mmp inlets and outlets on the way)

Anyways I'm 33 now and my days of externally dumped wastegates.. 3in exhausts and the louder the better are long gone..
But I also obviously care about final output..

So the question I think a lot would be curious to know. With all the mods above what can be expected to the wheels (other than noise) with a dp back exhaust system?

Is it worth the noise and smell getting rid of the secondary cats?
I'd assume weight would be a great savings, I pick bmw exhausts up all day and there not light lol..

So is it worth the noise over piece and quiet? What was your before and after and or what did the butt dyno tell you?

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N54 FBO exhaust gains