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Internal versus external Superliner air cleaners

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I learnt on here that the Superliner had external air cleaners as an option. The Australian models mostly seem to have it I am assuming to have higher air in takes in dusty areas.

What influenced the different preferences in the U.S models?

Did certain specs such as engine type influence which one was chosen?

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As always, it all had to do with requirement. In the US with the standard 6-cylinder engine, the 11-inch Donaldson underhood unit was adequate. And it could fit.

The optional cowl mounted air cleaners, available single or dual, in 13 or 15 inch diameter canisters, were necessary for extended service intervals, larger engines and/or harsher conditions.

An inline pre-cleaner was also an option (not available with the inside-outside air intake option).

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