>I got the Mondo bypass valve and it came with a gasket , but do you need the flange (8D003-051: Flange, Mondo Bypass Valve, Steel - or - 8D003-052: Flange, Mondo Bypass Valve, Aluminum) for the Vortech supercharger ?

 

It depends on what you're attaching it to. If you've got aluminum, I'd go w/ the aluminum flange.

 

>But do you need the flange ?Or can you mount it without the flange ?

 

You need the flange welded to an appropriate spot on the blower dischrage tube. I have a spare aluminum flange that I can send to you if you PayPal me $10. But as he said, that only works if you're welding it to an aluminum tube. Here's a pic of my flange location:
http://para.noid.org/~lj/bypassflange.jpg