I have the basic Greddy turbo package on my '91, and it's developed
the well-known crack just in front of the turbo flange.  At first, I
patched it (then it was quite small) with JB weld and all went well
for a good 30K miles.  Now, however, the crack has reappeared and
extends to the bottom of the manifold.  I've lost about 2lbs of boost
and tricked my oxygen sensor into making the thing run way too rich.
I first noticed that on my air/fuel ratio guage, but after a while my
blackened rear bumper made the gauge moot.

So....I'm faced with getting a replacement manifold, but first wanted
to ask if there's any possibility of just welding the crack.  I
bounced this off my extremely car-smart son (he's currently running an
'04 WRX STI with over 400hp....I thought my worries were over when he
returned from a tour with the Marines in Iraq, but I guess one's kids
will always be a worry).  He seems to think there might be a problem
with welding a manifold, but isn't quite sure.

Anybody have any experience in such a fix, or is it wise?

DonB
'91 white