I just got my 99 cobra 3 days ago I've seen the intakes your talking about and would like to know how they do on n/a cars also. By the way how is that cold-air kit you have and how much was it. Ive seen it advertised in the mags as the (highest gains for a coldair kit) better than C&L and BBK, do you like it, do you still have your stock massair?
My son got it for me for Christmas, so I don't know how much he paid. Everything else on the car is stock except for the exhaust. Seems to help a little over about 4000 and throttle response is sharper. The install was a little tighter than I expected it to be, but it went in. The heat shield doesn't seem to fit, so I've got some figuring to do there.
Scott Sullivan recommends his current intake for FI cars and pretty much "race only" NA applications. He says the milder NA cars will loose too much bottom end and mid-range.