I would think for V-band use on intercooler piping you'd need to run an o-ring... like this:

2.5" V-Band FLANGE Kit Aluminum Turbo Intercooler pipe:eBay Motors (item 350267303117 end time Oct-26-09 18:41:50 PDT)



V-band's don't really make a *perfect* fit without an o-ring or gasket or something. It's good enough for use with an exhaust, but IC piping with vaccum and boost might leak a little bit.

And those prices don't seem that great... I dunno. Not something I'd label find of the century.