I don't have the DNA kit, but I do have a K&N filter fitted, with the snorkel removed from the airbox, so the airbox lid is the same as the DNA one.
I think it's a worthwhile mod, as the motor does feel more "snappy", but I haven't had the time to get it on a dyno and check it out. My next mod when time allows will be a PCIII and a dyno session!

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-- Triumph Explorer 1200 --