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Typically it will be the flapper/seat, oil seals or bearing to go out. I believe the cheapest route is the VTT rebuilds or Stage 1's. That's $1200 or $1800 and both have the upgraded wastegate parts and optional upgraded thrust setup.
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2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
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