Alright everyone,
Good news for any owner in UK, however it's also good news for any other M235i owner.
I will be making a seperate thread for my car but thought I would post this photo and leave it here..
I will keep you updated.
One week later, the final product. Valves opened, recorded with just an iPhone 5. Lovely worble at idle, barbles/rumbles loads off throttle a lovely dep throaty sound. Very impressed, reccomend this system to anyone.