I have used K&N on most every vehicle I've owned. The looks and ease of maintenance over the Stillen sold me. My exhaust overpowers the sound of the intakes on my 370, so I can't comment on the sound. I will do a dyno soon, but with all the other mods I've done, there's really no way of telling what gains each mod got me. I'm just hoping for a 320 whp when all is said and done.
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BMW Z4
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