Hi Paul,Yeah i have just looked at that stuff,its a 1 ply stuff from ASH, they do also do a wire wrapped 2 ply kit too though
http://www.autosiliconehoses.com/silicone-hose-shop/air-ductings/black-silicone-2-ply-air-ducting.html
If we're working on the theory that more,cool air is whats required for a better expansion upon ignition= better power delivery,providing the ECU supplies the correct fuelling,then theoretically i could negate my 'size' issue with my original idea by making a twin intake rather than struggling to fit in a single larger one to the airbox.
If you look at air ducting products,they all start at around a 3 inch diameter,like Shaun has,which tells you that under that for a single intake system is probably not enough,especially for FI engines,though being N/A i dont see that having plenty of colder air available can be a disadvantage.I can run a smaller feed from the right hand side into the inner wing easy enough from the right hand side of the airbox,making sure the pipe isnt too long so its say a 1/3rd of the way inside the inner wing box.Its far enough away from the engine bay and nowhere near the bottom of the car.
I could then run another smaller feed from the other side of the airbox from my original idea,theory being that theres the same amount of air getting in as you would from a single bigger feed.Slightly over engineering the problem,but at least it means im getting enough cold air in which i cant really do from one feed as im restricted by pipe diameter both sides.But with two intakes i can get the same result .
Bwahey! it could work!Or,i could balls it up and be looking for a new airbox next week LOL. I shall use the Sonic way of thinking on this one.(without the setting myself on fire part)