This never seems to go away, and I'd post in the troubleshooting section but I never get a response there.
When I first installed my uppipe, a Cobb 303SS version, it ran fine for a few weeks. Then the lower gasket started to leak. I tightened things down at it helped but didn't eliminate the issue. Then I ordered some Crucial Cu-seal gaskets. They helped more than the OEM gasket that I bought for the install, but it didn't solve the problem either. The core issue is that the exhaust manifold does not mate perfectly with the uppipe. There is a small gap on the side most towards the front of the engine which makes the gasket flap when boost is on.
What I was thinking of doing when I get my parts for the downpipe install was to loosen all the bolts on the uppipe, upper and lower, and try to figure out how to loosen the turbo mounts. Inspect the lower gasket, then tighten from the lower part of the engine to the top. I looked on scoobymods for turbo removal tutorial but it's not descriptive enough when it comes to finding where the turbo mounts to the engine. Does my procedure sound like a good plan, or does someone have a better idea on how to fix my exhaust leak?