would i be able to buy the hose part of the Gsr induction kit for a sei/cinq as i have a bmc cda and a bob just need the hose to finish it all off Please reply if anyone knows?????

Nope. Quite rightly Rob won't sell you just the tube, its where the profit on the kit is made. His words at Stanford last year.
Oddly he wouldn't sell just the filter so i had to buy it from some random company instead.

Check what sizes you need and contact SFS...