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OP has a stock engine and he already changed the real problem piece which is the (charge) pipe itself. I see no point of changing also the dv if he is not after a specific sound or a tiny bit more power (if any) etc. I thought about Forge myself in the past but simply couldn't justify it despite trying hard, and even with Forge there were occasional reports of issues.
I am happy with the performance of ER charge pipe with stock dv, I bet I would not be happy for too long if I would have higher boost levels.
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.
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