Based on all that I've read, it seems that you get the biggest boost from your first intake/exhaust mod. After that, the gains are in smaller increments. So, since you have the Stillen CBE (which is a very nice sounding exhaust, BTW, with proven gains), you won't as much in the way of gains from intake (unless you get a tune).
I agree with other comments that the OEM intake is well designed. I went with K&N drop-ins, and like the combo with my aftermarket exhaust.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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