I have a Gsr dude
I have found them to be good!
Price a piece of straight pre packed 15cm silicone from Autobahn etc and convert it per metre then you will see how Excy per M it is
I have got 2x1M length's of straight 2 and 2 1/2inch hose that cost me about $150 delivered!
Also got some reducers for the air intake!
Check out my members ride
Lucky I got them in about july last year because the prices have jumped