135 n55 custom zorst vs BMW performance zorst

Hey fellow fanatics
I am well aware there may be some topics similar to this thread around, but after searching I am still undecided. Also from guys who have a custom exhaust or the BMW performance zorst, your thoughts would be appreciated.

I would like an exhaust that cracks and pops like a mofo, is nice and raspy and around 30/35% louder than stock, but no drone. So when you hear the zorst but don't see it you think dam what is that and not dam whose straight pipe citi golf is that.

It needs to be a cat back option. As I would like to keep cat in place. I would get it so its an easy bolt on and off set up, so going back to stock for service/ claim is easy. Has any one got advice on what set up will achieve this?

So, my thoughts are, on the n55 135i there is only a mid box and then the back box, what is your advice on the mid box? Will there be drone by removing it and putting in a straight pipe to the stock back box?

or

Keeping the mid box and removing the back box and getting a straight pipe/s from there will this be too loud/ cause drone

or

getting the BMW perf zorst only

or

getting the bmw perf zorst and staight mid pipes (ie no mid box)

or

complete custom cat back zorst....

any input will be appreciated.