Question on a V-band Clamp.

[RadarRider]

Forgive me guys for bombing general diesel discussion with all sorts of problems, but here's yet another one. Today I finished installing my guages & took it out for a spin with a buddy who help me put it together. The turbo makes a chirping sound @ about 1/4 throttle then hisses @ WOT. I brought the truck home & my buddy checked out the exhaust clamps(just installed Monster Exhaust yesterday). All the exhaust clamps are tight from the downpipe to the tailpipe. I've checked to make sure the new Banks compressor wheel wasn't the culprit. Turbo's fine. So the only other place I think the exhaust leak is coming from is the boost pipes that come from the exhaust manifolds to the turbine. Does anyone know what size that V-band clamp is that mates the turbo to that pipe? Can anyone give me info on where else to check?