No good reason on the 540 - same motor... MPPSK system...
Probably because it is VERY loud compared - I suspect it would be "too loud" for the 5 series crowd...
See my video up top - its louder now that I have about 10k more miles than when I took that video -- much much louder actually. I love it.
When in comfort its virtually stock sounding.
With the JB4 it pops like crazy - which I dont like much.
Quote:
Originally Posted by Jams_123
Hmmm ..... very interesting! I'm sure there's a good reason(?)
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