Kev is right. I first rode my brand new Ten' (had a BMW K1200S too) and did feel it was a bit flat and needed to breath more. So I changed the air filter to a K&N, fitted Kev's fuel mod, blocked the AIS to stop the popping, removed the air box snorkel and fitted an X Racing single pipe - result is really a different bike that responds and revs as you like.

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