[s-cars] where's my intake whine?

[Mike Fitton]

Okay, I'll go ahead and admit that I've been lazy and haven't even 
attempted to pressurize the intake and see what's up.

With that out of the way, here are the symptoms.  When the engine's cold 
there's a very noticeable whine whenever the boost gauge reads to the 
right of about 5inHg.  I don't usually boost it at all when it's cold, 
but in the interest of science I decided to a few times.  It makes the 
whine under light vacuum, light boost, and dead in the middle as far as 
I can tell.  The noise mostly goes away when the engine's fully warm.

I don't seem to be having any trouble achieving my usual max boost in 
the low 20s.  It's possible that I'm imagining it, but it might be 
taking slightly longer to get there.  If it is, I wonder if that could 
just be climate change (seasonal kind, not Soylent Green kind).

I could very well be mistaken, as this one has only happened once.  I 
think I once heard the diverter valve activate momentarily while I was 
full throttle on an on-ramp.  I glanced at the gauge and didn't see it 
moving, so either I imagined it or didn't look in time.  I haven't 
noticed any other strange noises that sound like a failing DV.  It's a 
metal Forge valve, so maybe it makes different sounds than the 
well-documented failing stock DVs.

I've been itching to buy the Apikol IC kit, but I don't want to spend 
the money now if I don't have to...especially if the problem is with a 
part that kit doesn't include.  I've gone through and tightened/replaced 
as many of the intake clamps as I can easily reach, but to no apparent 
avail.  Visually, everything appears to be in order.

Any thoughts?  Make a pressure tester?

-Cheers!
Mike