Sprint Filter P08 F1-85 Air Filter for Racing – Suzuki GSX-8T (2026) SM245S F1-85

A parallel twin does not sip its air. Where a four-cylinder engine takes four modest breaths per cycle, the GSX-8T takes two big ones, and the demand at the filter face rises and falls with them — the peak sits well above the average. That is the honest argument for a high-flow medium, and it comes with a bill worth reading. The Sprint Filter P08 F1-85 passes 15,000 litres per square metre per second through cloth rated at 85 microns; the standard P08 passes 5,050 through 80. The extra flow is real, and so is what it costs: 85 microns is a wider gate than 80, and that only adds up on an engine whose maintenance is counted in running hours.

Key Features

• Dry woven polyester in racing specification — 85 micron rating, 15,000 l/m²/sec
• One step more open than the standard P08 at 80 microns and 5,050 l/m²/sec; the flow has a price
• Peak intake demand on a twin runs far above the mean — headroom used in bursts
• Nothing oiled that could be drawn downstream onto sensors or butterflies
• Goes into the series airbox as it stands, with the standard fuelling left alone
• Serviced dry with compressed air and refitted; cover runs two years from purchase

How a twin asks for its air

Intake flow on a two-cylinder engine arrives in pulses rather than as a steady stream, and a filter has to be sized for the crest of those pulses, not for the mean. That is the part of the specification a racing medium addresses. What it does not do is turn a series motorcycle into a stronger one. On a GSX-8T with standard exhaust, ducting and calibration, the share of intake restriction the element itself contributes is small, and no filter hands back more than it took. This one earns its place further along, once exhaust and mapping have been opened up and the airbox is the term left in the sum.

The five microns you are handing back

Filtration and flow move against each other: the tighter the cloth, the more it holds and the less it passes. The range is laid out along that line — T12 at 7 microns and 560 l/m²/sec for extreme ground, P14 at 14 microns and 1,800 for dust and long distances, P037 at 37 microns and 4,500 for wet air, the P08 at 80 and 5,050 for road and track, and this element at the far end. It is not a ladder with a top rung. If the 8T stays a road motorcycle serviced by mileage, the P08 is the element for it, and no compromise. The F1-85 belongs to a bike whose engine has a date with a workbench.

Care and cleaning

The SM245S F1-85 is cleaned dry. Put an air line on the clean side and work the dirt outwards, the way it came in. When air alone stops being enough, wash it in lukewarm water with a mild detergent and rinse until the water leaves clear. Dry it in open air, right through, with no heat of any kind and no naked flame anywhere near it, then refit it dry. Oil never comes into it. The maintenance sheet from Sprint Filter is in the Downloads tab.

Fitment & Compatibility

Built for the Suzuki GSX-8T of 2026, replacing the series element in the standard housing. Four Suzuki models share this part; they are all listed in the Fitment tab.