it was an option chris but got the job i went for so no need to! (although i do now have a cheap OEM airbox which is unused and a new ornament in my garage)
![happy2 :happy2:](https://www.mk5golfgti.co.uk/forum/Smileys/newsmileys/happy2.gif)
no noticeable difference in performance and sound between either IMO, fitting on both units are similar as you would expect