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Just wanted to keep everyone in the loop in case someone does a search later on and my thread pops up. The car got the fault code 4530 a couple days ago. I ended up replacing the vacuum actuator near the firewall and all the vacuum lines and my original fault code P2457 (EGR) Cooling System Performance strangely disappeared with fault code 4530. So I'm assuming the vacuum lines I replaced above the turbos did help something out even though they appeared to be in some decent condition. The car has a lot of power and boost now.
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2013 335is - sold
2011 335d
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