Aem intake vs stillen gen2 vs stillen gen3
 

I know there is a cult-like devotion to the Stillen intake on this forum but...

...I see the new AEM intakes and stillen Gen2 are really similar. However Aem declares up to 15 HP increase against 9 HP of Gen2...
Why is there that difference? Metal vs plastic piping, filters, just numbers...?


@mcspooney and @jonnydrama in other link ( http://www.the370z.com/intake-exhaus...m-intakes.html ) have told to us they find very similar HP gains AEM instakes (short) and Stillen Gen3... We have any Dyno result or another experience...?