Improving airflow

[MadProf]

Have had a K&N induction kit fitted to my S2 for ages now but I am aware that the ducting guiding cold air onto the filter is just crap and is not doing the job it could do.For a start it is crimped in the middle slightly where it has been bent to shape itself onto the filter.So I have to sort it out asap.I have looked around and have seen cold air ducting kits like Piper that have two polished trumpets at either end of some longer and and more wider ducting hose.This certainly looks an improvement to what I've got doing the job at the moment but I'd like to know what others are using,any advice would be really appreciated too.Has someone out there got the ideal set up?Does the size of the ducting hose make a big difference?as I have seen hoses from 50mm to 90mm in the shops,I would have thought it has to be fairly wide to work.Anyway so what improvements are there to be had?

[TIPPER]

I've got an empty catering size Nescafe tin,some 100mm ali hose that came from B&Q and a few clips from which I've been meaning to make some sort of sealed enclosure for my K&N. Doubt I'll ever get round to it though.
I wouldn't spend a lot on trying to feed ambient air (from outside the car) to the K&N, unless you can totally enclose it I would think it will always be compromised. One of these days I'll buy a Hurricane or ITG - or maybe not, its mainly only noise anyway.

[Cuzza]

You can get ducting and the trumpets from GPR or Demon Tweeks, they evn do different ducts so you could get the right size to attch to the inside of the clam - or, you could just put back on the perfectly servicable sealed induction system that comes with the car and add a K&N panel filter