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Redline for a B20F? 140-160

To what RPM can a stock B20 (144/BW35 shouldn't make a difference) safely be taken to? When mine hits at around 4K, it's throbbing pretty good. With the BW35 I'm probably only doing 60-65 mph at that RPM. The M41 will improve that, but just for my information, what do these things do, stock, before you need to worry about spinning a bearing or worse?






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