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2 questions....
On the topic of drone, isn't there some drone with all of these aftermarket exhausts below 2,000 rpms? I've been hearing a lot of resonance, vibration, etc. at low rpms on all these exhausts. I'm a bit perplexed when some say there is no drone etc on some systems when my experience is just the opposite. The m5 just seems to have a tendency to have it below 2k rpms.
Secondly, do the valves on the eisenmann sport help on that cold start? Or is it only a slight insignificant difference than those systems (particularly the rpi gts) that does not have these valves.
Thanks
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