E92/3 Exhaust mods

[MingtheMerciless]

I have an E93 and am considering an exhaust mod - something like an Akropovic - but what have people here tried and liked? I don't want a hooligan sounding thing, and would like the odd track day so under 105 db or switchable.

Thanks.

[MingtheMerciless]

Good to see a recommendation of the Akra - does it have any everyday downsides - like boominess or harshness?

And what is the two pipe mod?