Sprint Filter P08 Air Filter for Road & Track – Royal Enfield Himalayan 411 (2021–2023) CM199S

A parts catalogue gives its opinion twice: once in what it lists, and once in what it leaves out. Around the airbox of the 411 Himalayan the programme runs in a single direction. There is this element, the standard woven CM199S, and there is the extreme grade below it; the fine grade completes the code family for the Scram. Above the standard there is nothing at all — no racing medium has been drawn for this housing, in a range that offers one for most sports and roadster boxes. Read the listing that way and the P08 is not a middle rung here. It is the open end.

Key Features

• Woven polyester in one layer, run dry and never oiled, rated 80 µm at 5,050 l/m²/sec
• The most freely flowing of the grades catalogued for this airbox, and the coarsest
• Roughly twice the filtering surface of other performance elements, folded into the series housing
• Fits the standard airbox as it leaves the factory: nothing cut, nothing relocated, no remap
• Held back 93.13 % of 100-micron particles in Sprint Filter's own comparison, against 76.42 % for four-layer oiled cotton
• Cleaned and refitted rather than thrown away, with two years of warranty from the purchase date

What the missing rung tells you

A racing medium exists to pass air at a rate that a road engine on public roads is never in a position to demand, and Sprint Filter has not drawn one around this box. That fits the machine. A 411 single built for unsurfaced roads is not short of air on any day of its life; on some days it is short of clean air, and the finer grades in the family are there for exactly those. Everything in between — the commute, the pass road, the long day on tarmac — is what this element covers, without asking the owner to predict the next stage.

The part of the claim that survives

A drop-in element does not make a standard motorcycle noticeably stronger, and no sentence here should be read as promising that. What the woven polyester offers is an intake restriction that keeps coming back to where it began. The face can be cleaned to the state it was rated in, so the flow figure is one this element returns to at every service instead of one it drifts away from. A pleated paper panel has no route back: from the day it is fitted its resistance climbs, quietly, and the only remedy for it is a new panel.

Care and cleaning

The CM199S is serviced dry. Put an air line on the clean side and work outwards, so the load leaves the cloth the way it arrived rather than being pushed deeper into it. Where the deposit is greasy rather than dusty, lukewarm water and a little mild detergent will lift it; rinse until the water comes away clear. Then let it dry in moving air, in its own time, with no heat gun, no oven and no flame anywhere near it, and refit it dry and untreated. Sprint Filter's cleaning sheet sits in the Downloads tab.

Fitment & Compatibility

For the Royal Enfield Himalayan of 2021 to 2023. Sprint Filter lists the same element for the Scram 411 of 2022 and 2023, so two machines share this number. Confirm your own build year in the Fitment tab before ordering.