When going from 2.5" to 3" you might need to rescale the MAFs to get the (if any) benefits from a larger intake. I know when I went from takeda to AAM I had to get a tune as the car did not like the 2.75" without something being tweaked.
Which brings me to bring up: AAM has had their 2.75" intake around for a couple years now.
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2009 G37X | 326 AWHP | 264 AWTQ
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