The original 'Shannon' branded induction pipes reduced air noise due to their construction and design. Their current ducts are a bit diffrent from what we had:
http://www.shannon.co.uk/Auto/automotive.html
Nowadays, most people fitting a replacement use a neoprene type ducting from eBay.
This HowTo will explain:
http://www.the75andztclub.co.uk/foru...ad.php?t=36976
TC