I started out with a K&N filter...I can't say I saw a difference only because the car went from the dealer straight to AutoZone to get it...installed in the parking lot and removed the silencer, lol. I got a best 14.05 out of it. I changed to a MAC CAI fenderwell kit. I got a best 14.4 out of it. I took the 90 degree bend off and put back the factory box with the K&N and picked up 4 tenths on the very next run. i was averaging 14.4 - 14.6 with that basted thing. I still lost 3 mph overall and am still trying to find that problem, but that's my findings between K&N/stock box vs. MAC CAI.
By the by, I left the chrome tube between the MAF and the TB in place...debating changing that back to stock at the track for testing purposes. I'll keep you posted.
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