something like this, with the appropriate size coupler to your primary turbo inlet. best way to find even tiny leaks only present at higher boost, IMO. Get Your Boost Back!
but have a close look underneath at the exhaust manifolds. when they start leaking, the metal gasket can make a pretty high frequency noise. pretty common on these engines too
you can actually make them yourself really easily. just use one of those plumbing caps, drill a hole in in the end to install a tire valve stem. then just get the coupler and clamps to adapt to the inlet. use a tire chuck with a gauge to pressurize the system. just be careful though. since the cap has no bead, that coupler can slip off if it's not on there good and tight. maybe some brake clean between the coupler and cap. hairspray might work well at keeping it on there too
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