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Pair valve is throwing fresh air into exhaust to make catalytic convertor to burn better exhaust gases, to get euro4 requirements, that's all. If catalytic convertor there is no more, pair becomes useless. On dyno you need to cancel pair because induce false reading of exhaust gases.

Mostly on roads, ocasionally on track. I had 600rr, R1, RSV4... Now I have KTM 690SM and S1000rr and going for a KTM 300EXC to enduro...

Hello! From a month ago I'm new owner of a s1000rr 2018. Glad to be here! Adrian