After looking at mp5's car... I can't see how the performance difference is so minor. I've seen a dyno for the Injen CAI, but not for the AEM. This picture doesn't show it very well, but Marc was complaining that the intake filter is only a couple of inches from the fan behind the radiator. When the engine gets hot, that fan kicks on, and it blows hot air straight into your intake. That could be a difference of 75 degrees going into your engine, which would definitely make a performance difference.

 

Have a lil trust on AEM. I have called them several times about different things and my brother has also for parts for his Acura. AEM has been around longer than any other company like Injen and AEM has far more money for R&D than Injen. AEM researched and made the best intake possible for our Proteges! AEM tunes the length and diameter of the intake tube first, then they try to locate the filter in the best location possible with the given length of intake pipe.
My brother has a 00 Integra GSR making 179 whp with just i/h/e/cat/OEM Type R cams/cam gears/VAFC?dyno tuning. he switched from an AEM CAI to an AEM short ram and picked up HP!!
Longer intake pipes sucking cool air are NOT always better!! Think, people, think!
I doubt Injen even bother to test a short ram intake!