The stock filter housing or the FASS system like we use?
If stock you can redrill and retap... ... ... ... ... ... .
If stock you can redrill and retap... ... ... ... ... ... .

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Walt-L said:Vaughn,
To be truth full here the ID of a -AN6 fitting is . 265 (slightly over 1/4") and the first 3 banjo eye ports from the LP to the filter are . 170 (slightly under 3/16ths). Couple the upgrade of . 265 ID from OEM . 170 with all straight fittings (no hard right angle banjos) and 90 degree "sweep" fittings for your turns and I would say you have made one HELL of an improvement on fuel flow for a truck that will see a moderate amount of modifications.
JMHO
Walt