it is!!! but when you put a 51mm hose on, it just slips on, that 51mm is the beaded end, so you want it tight over this.
the forge 5 piece hose kit comes with the turbo pipe, and this is 46mm for the turbo side.
you want it to be snug down the shaft but tight around the rim, no leaking

I KNOW I TRIED IT LAST NIGHT AND HAVE NOW SENT THE PIPE BACK
but do as you want and dont ask in future!!!! let me know how you get on
