Noise reduction, apparently. It's an absolute b**tard to get out, by the way, if you're thinking of it. It definately gave a benefit when i had the Renegade filter in but I couldn't say if it does for the BMC, never had it on with that filter.
BTW, once I'm back on the bike I'll be getting various dyno runs done, to comapre the RS with a desnorkelled stock filter among other things... So if you're OK to wait I can hopefully give you conclusive figures (won't be tuning for peak power for both, just a/f charts to compare.)
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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