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05-24-2018, 11:47 AM
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#3
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New Member
Drives: 2006 M Roadster
Join Date: Dec 2017
Location: Greenville, SC
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From the comments...
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Former Z4 owner here and I agree with your post. There’s another problem with boosting these that I don’t see addressed anywhere... the rest of the drivetrain. The Z4 didn’t have enough room for the beefier clutch, gearbox and (IIRC) driveshaft of the M3 with the same engine, so it retained the stock Z4 pieces. It was already somewhat questionable pushing 340hp into those parts. I definitely would not want to be pushing more without at least a good clutch upgrade, and there’s just no mention of that. For all of the researching I did during my years of ownership the conclusion I came out with was that this is a simply a poor platform for forced induction applications (sorry ESS).
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