mines a bit of a mish-mash of bits really. The inlet to the turbo is tiny really. I've got a piece of 44mm ID silicon which fits onto the turbo inlet. Then clamped two pieces of progressively bigger silicon bits I had knocking about in my garage over the top of that, the end result was then big enough to clamp on the ducting and filter I already used with the g-lader. You could probably buy a reducer that would look nicer but I just used what I had lying about for the time being.