Ok so I finally got my M Performance exhaust for my F30 328i a couple of months ago. Thanks for MAX for all the advice!
I paid R12400 for the box and got it fitted fot R600 @ SMG Pietermaritzburg (Cheaper than most)
I must say it is relatively expensive, but it is worth every penny!

raise:
It really makes it sound like a 180kw engine. I think the 4 cylinder, with OEM exhaust makes the car sound a bit PUNY.
There is no noticeable power difference, but that not what I wanted the box for.
The exhaust sounds roughty, loud, bangs on up changes and flutters very nicley when comming off accelerator
Put your foot down at a robo and people get sooo confused! :roflol:, sounds like a DSG.
Anyway the box really complements the 8 spead Sport auto, Everyone would really enjoy it!