You can use the standard induction hose that went to your old airbox.. but as mentioned get a Samco hose.. much more durable, the OEM one will eventually break...
Just to update, I just fitted a replacement Induction hose from Samco..
Only bad thing is that the Samco hose is less flexible than the OEM and as result is a very awkward fit.. due to the fact that I have an RBC intake and the Gruppe M.. Just wondered if anyone else had the same issue and did they have to modify the Samco hose?