Anyway, i finally got the quad exhaust done on the e90 but the diffuser is a real pain to fit. I got a call from the guys doing the exhaust saying it needs some serious work in order to get it to fit the e90 they thought as the fitment was so bad maybe diffuser was for e92/93 instead. But i have assured them its for an e90.
some pics of the initial test fit. They need to trim the inside of the LCI OEM Msport bumper first then will see how they get on.