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I'm no turbo expert but looking at the pics of that vs RB's and others in the recent turbo threads that looks like an upgraded stock sized turbo which already is capable or 400+HP so if that is the case I would consider selling those and buying a tune. Without a tuner to adjust make adjustments you can do all you want to these cars and it will only result in stock like performance at best.
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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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