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      11-15-2019, 09:59 AM   #2
First Lieutenant
United Kingdom

Drives: 2007 E92 335i
Join Date: Oct 2016
Location: York, England

iTrader: (1)

sounds like the common N54 wastegate rattle, BMW will not do a repair kit, they will just swap turbos. You can buy a kit off ebay but they have to be cut out and its not an easy job. If I were him I would take this opportunity and swap the units out for a set of Pure stage 2 high flows (cost circa 2800 on black friday deal) or he can buy china turbos for 1500ish. either way the turbos have to come off, which is quite a big job as the front subframe has to come off too.
Without wanting to pee on his matches it sounds like he could of bought a minefield. Bothe waterpump, thermostat and wastegate rattle are pretty common but expensive issues on N54 motors....along with coils, injectors, high pressure fuel pumps.
it might be worth looking at purchasing the BMW extended warranty and then claiming after 2-3 months?
2007 E92 335i, JB4 + custom back end flash, DCI, Downpipes, FMIC, Silicone inlets, Pure Stage 2 High Flow Turbos, Spec Stage 3+ Clutch and Single Mass Flywheel,