Take the IC off if you're inclined and as Clint said, check the lines around the turbo.

I had an issue with one of my lines, causing the turbo to overboost something wicked (line cut to wastegate actuator).

All sweet afterwards.

When you're running 18pound+ through it, they slip off. I've wire tired all my vacuum lines onto the nipples.

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[SIGPIC][/SIGPIC]
Should have bought an STI