K&N Air Filter Demonstration! (Using K&N Demo Kit NOT OPEN To The Public ...
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K&N 33-2031-2 Replacement Air Filter


if kn air filters are so good then why dont all car manufactures have them put in there cars when built from new? also what are the pros and cons of instaling one in my car.
K&N air filters were great aftermarket add-ons when cars had carburettors. The air speed and associated vacuum effect meant that the fuel/air ratio was maintained (assuming that the carb jets were capable of the fuel flow required.Current engines with management systems are carefully designed to use the air filter that they were designed to use. Arbitrary replacement of the filter with a K & N one could cause the system to run 'off map' i.e. in a way that it was never designed to operate, and would inevitably result in worse performance, rubbish fuel economy and potentially a fuel mixture so weakened that long term engine damage may result. Remapping the system may work, but can be costly, for not much power gain. So the answer is don't throw a K & N on just for the sake of it. Cars that are sold with K & N filters as standard have been specifically designed to use them.
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