Sprint Filter P08 Air Filter for Road & Track – QJ Motor SRK 600 Pro (2025–2026) PM209S

An oiled cotton element carries a variable nobody prints on the box: whoever treated it last. Apply too little and the weave passes more than it was meant to; apply too much and the surplus has only one place to go, which is downstream. The P08 removes that variable by never introducing it. The cloth leaves the factory dry and goes back into the SRK 600 Pro dry every time, so how it behaves after its tenth cleaning is how it behaved on the first morning — a property that has nothing to do with how careful its owner happens to be.

Key Features

• Dry from manufacture: no oil to apply, judge, or get wrong
• Single layer of woven polyester, 80 µm at a rated 5,050 l/m²/sec
• Stopped 93.13 % of 100-micron particles; four-layer oiled cotton returned 76.42 %
• Drops into the standard SRK 600 Pro airbox with no modification needed
• Nearly twice the filtering surface of comparable performance elements
• Serviced with compressed air; two years of warranty from the date of purchase

A number, not a preference

Dry against oiled is usually argued as a matter of taste, but the same comparison has been run as a measurement. On 100-micron particles the P08 held back 93.13 %, against 76.42 % for a four-layer oiled cotton element tested alongside it. That is a wider gap than the debate normally allows, and it points the opposite way to the assumption that a tacky surface must catch more. The reason is that a woven cloth does its filtering by geometry, which is identical on every panel that leaves the line, while a treated one depends on a film applied by hand.

Nothing left behind

The second consequence is what does not happen downstream. There is no oil in this element that could be drawn out of it and carried into the intake tract, which removes a failure mode that gives no warning and is unpleasant to diagnose once it has. It also shortens the service: no drying time after re-oiling, no waiting for a treatment to spread, nothing to buy alongside the filter. What none of it does is add power. A drop-in element will not make a standard SRK 600 Pro faster in any way you could measure, and its case rests entirely on how it filters and how long it lasts.

Care and cleaning

Compressed air, applied to the clean side and worked outwards, is the normal service and usually the only one required. When the panel has collected something oily rather than dry, lukewarm water with a trace of mild detergent lifts it — rinse thoroughly afterwards. Let it dry in air alone; heat guns, radiators and naked flame all damage the weave, and a damp element must never go back into the box. Sprint Filter's maintenance sheet for the PM209S is in the Downloads tab.

Fitment & Compatibility

Cut for the airbox of the QJ Motor SRK 600 Pro as built in 2025 and 2026, one element per machine. This code covers seven models in all, under both the QJ Motor and Benelli badges; the complete list is in the Fitment tab.