Yeah, there was a vendor selling thicker up-pipe gaskets. I can't remember who, because it was months ago, but it was a Subaru dealorship, selling in Vendor Classifieds, for like 20 bucks. It fixed the screamin demon.

 

If you didn't torque anything. It's almost certainly a leak. 26ft/lbs is not a whole lot of torque. You'll be suprised just how little. Did you replace all the gaskets? Gaskets are cheap compared to the PITA of taking the whole thing apart again.

Loosten off all the nuts and bolts, then retorque them.

If you didn't download the directions from vishnu tuning, then do so. Shiv gives a very specific order for tightening and torquing that has worked perfectly for the three uppipes that I have done.

Finally, how loud is this sound. With a SS uppipe you should hear a raspy whine when the turbo starts to spool. This is completely normaly. It's one of the many great reasons to replace the oem up-pipe...in fact when you finally go with a Turbo Back this sound becomes much more pronounced.