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      01-15-2014, 06:52 PM   #26
evo335xi
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Downpipe leak would make it sound boxerish/running on less cylinders or even like an open wastegate. The leak would be very audible underneath you.

It's possible the turbo is on its way out and causing some noise, my money is on the chargepipe/intercooler not being secure enough. Tighten everything down and see what happens!