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I live in southern Spain for a large part of the year where it is very dusty and the combination on my XT660R of Stage 1 filter (slight improvement) and the Stage 2 DNA (huge improvement) with the PC III and appropriate map gives me a great torque boost throughout the range for riding in the mountains. The Stage 2 actually improves filtering when it gets dusty as the filter oil traps even smaller dust particles as it builds up. Try one and I guarantee you won't be disappointed.
No experience of the 2-1 but I believe that you may experience even better gains in torque terms from that set-up.
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