Scott from Maddat (before he had maddat) made it years ago, it's just 3" stainless welded onto runners and a TB flange welded to the end. Simple but very effective.

I'm also very interested to see what it pulls on the dyno, should be around 70~80rwkw ATM on 8psi and hopefully around 100~110rwkw on 15psi. Its no CA or SR numbers but still enough to be fun!!!
Will let you know when it goes in. smiles all round ATM though.