Easy to do Take the 2 airfeeds off the box, just twist and pull. Then undo the 2 jubilee clips (the one on the throttle body and the other 1 above the box) then take the pipe off and take it out then take the box out and change it over. Much easier changing it with the box out of the engine. With the box it has 4 metal clips holding the top on, just take them off and the top should come straight off to get the filter out.