I have had a K&N on every car I own and the quality has always been great. It's oil soaked cotton, I can't really see why there would be that big a difference between the two. Just like you can't really tell the difference, interms of HP, between one slip-on and another.
I wasn't necessarily talking about HP. On my '85 5.0, '88 300Z and now my '98 Monte Carlo Z34 the filters have been well builtand didn't seem to be cheaply made. I don't know has their quality gone down that much in the one and a half years since I bought one, I hope not.
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