they are the best, for full scale auto's. your nitro engine is extremly sensitive to fine dirt and dust. a full size cars engine can digest fine dirt and dust and keep on going, they have rings to seal them, oil filters to protect them from contaminants, they are built totally different from a nitro engine. a nitro engine is sealed by a very finely machined pinch, thier fuel is their oiling system, and they have no way to expel contaminants other than the exhaust port. which as it just so happens by the design of the engine, to be a better place to ingest dirt that expel it by way of reverberating exhaust pulses. keeping dirt out to begin with is of the utmost importance for a nitro engine.
a 2 stage foam filter with oil on both stages is arguably the best filter you can run. sorry to dissappoint you, but hopefully we can save you from a short engine life on that rather expensive engine.