While in a pondering mode earlier today, I couldn't remember if it had been asked before whether the Off The Road air filter would offer similar power gains as the DNA Stage 2 set up. Because the way I understand it is performance gain is achieved mainly through the fact the 'mouth' of the filter is wider than a stock filter where the air is drawn in.
I believe the OTR filter also has a wider mouth over the stock one as well. Or is it just because of what the DNA is made up from that also helps it over an oil & foam version?
& if an OTR were fitted, would a Kev Fuel mode need to be adjusted to a similar setting as a DNA?

Cheers.

To some extent it's the size of the opening, which is why ditching the snorkel makes a difference. It is more to do with the pleating of cotton filters as it give a massively increased surface area exposed to the air.

A DNA (or K&N for that matter) will flow more air than a foam filter. Foam is better at dealing with fine dust particles than cotton. Foam filters need cleaning more often as the drop off in air flow is quite marked over time (but you'd expect that as they trap more fine cr@p). Cotton filters actually filter at their best after they've got a few thousand Kilometers on them and in use don't tend to loose airflow as readily as foam.

It's all a toss up between peak airflow and filtration - you can't have your cake and eat it! For road and infrequent light off roading, then go cotton. For serious off road and in dusty conditions foam is the way to go.

The other advantage of foam is you can carry a clean and oiled spare element in a zip-lock bag where ever you travel; it's light and takes up no space.

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