as people said the stock intake is pretty good. The Stillens would be better. can you properly test the gains on a dyno, its hard.
Find a dyno that is in doors in a temp controlled facility and with a wind tunnel and the testing will show that the stillens are probably the best (just be design)
The OEM is probably on par with the AEM / Injen except for the rougher tubing / more restrictive filter.
The issue mostly comes up with gains/$
But, i can tell you that when i removed my stillen Gen III's theres definitely a flat spot in the power at the high end.
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