Scott Trask wrote:

 Hi
 I have a 13B with a turbo charger. What size air cleaner do I need? I would
like to use a K&N cylinder shape filter.
 Scott Trask RV7A

Good question Trask. You need to ask K&N what the pressure drop is across
their air cleaner when your engine is generating peak power. If the air claner
drops the pressure one in of Hg that would be about 1/29 loss or 3.5%.
250 HP that is a 8.6 HP loss.

Paul Lamar
 
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