i'm changing one at a time. i put the k&n in last weekend, and i'll see what that does after one tank. then i'll change the tube. i think it's smoother with just the filter alone though. nissan/infiniti should be ashamed of themselves. that paper shit i pulled out of my car before i put the k&n in was a joke.
btw, did any of you put the sticker from the filter on your cars?
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