K&N pancake filters offer up to a 40% increase in air flow and improved longevity over standard filters. Supplied in mirror polished stainless steel, with K&N motif. To maximise the benefits of this upgrade, pancake filters should be fitted in conjunction with Stub Stacks to smooth air flow into the carburettors. NB Richer needles required. When converting to pancake filters it is necessary to use shorter screws. For HS4 carburettors use 4 x GHF120, for HIF4 carburettors use SH505051
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