Do They Work? Air Cleaner

Do those modified air cleaners they sell on ebay and other sites, with a short duct tube and a K & N mini air filter on them work on the Isuzu 4 & 6
cylinder for a little more grunt and air? Also looking for a good site that has aftermarket accesoriesfor Rodeo Thanks.
JMC
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JMC wrote:

K&N filters won't increase your HP or MPG to any appreciable level. A cold air intake can help some. I'm not a fan of the K&N because it allows too much fine dust through. You might look at Calmini for aftermarket and performance parts. They've been around along time.
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