Hi Andy some good ideas, I used to have carbon fibre difuser on mine they're a lot of money £320 I think, what about covering standard one with 3m carbon fibre vinyl as a cheaper alternative? There are some pics of my car as it was before I removed the JCW aerokit in link below, I still have the front bumper though if you're interested and my wheels will be going too. The JCW performance kit is a great addition, look forward to seeing the changes

http://www.miniclubuk.com/owner-modi...-ians-mcs.html