The M40 wants to be driven at lower RPM, the indirect actuated valves are also a less harsh sound, there is no chain clatter, and the factory exhaust manifold probably holds down even more noise.
You've also aged, and your hearing has changed to some degree. In my early 20s I liked the M42 sound, once I was over 30 it got slightly annoying.
You've also aged, and your hearing has changed to some degree. In my early 20s I liked the M42 sound, once I was over 30 it got slightly annoying.
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