Only going by video clips, I found the F.I. and the ARKs to have the best sound. They both give that deep VQ rumble. I was set on the ARK as I wasn't interested in waiting for the F.I. but I ended up finding an F.I. in the classifieds on here.
I don't think you can go wrong either way.
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F.I. / K&N / 180 / Forgestar 
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