well after about 3 hours lying on the floor trying to fit that beast it went on without too many problems. Just very fiddly when youve only got the car up on axle stands. I had to modify the two hooks on the backbox as they were much further apart than the old one i had on, so i bent them closer together to make the rubbers nice and tight.
No knocking on anything yet, although fitting the centre section to the downpipe didnt go too well as it seems to be blowing a little from there