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BMW 335i 135i 535i N54 MHI TDO3L Wastegate Rattle Repair DIY. Here are the Parts to Fix The BMW N54 Wastegate Rattle Which Causes Loss of Spool, Horsepower, Fuel Economy, and Drivability. Please Watch My Instructional Video On Youtube: BMW 135i 335i 535i N54 Wastegate Rattle Fix DIY, I also Have a Rebuild Video On the Turbochargers on Youtube: BMW 335i 135i 535i N54 Turbo Rebuild . Also Notice the length of the shaft, it's longer than the factory style for more surface contact. And will give a longer life span.