I've had multiple AEM intakes in the last 10 years I've been in the import scene. I've been proven time after time that the bypass valves in fact DO take away the gains. On the aftermarket applications, AEM chooses the bypass valves as an option. I've always stayed away from it and I've been to multiple dyno day events, seen third party dyno charts, etc showing the power loss as a result of installing the bypass valve. If the bypass valve had absolutely no drawbacks, why do you think AEM doesn't have it fixed welded to all their applications? There is a reason for that and they know it. If you think about the concept of a bypass valve, it makes absolute sense that it takes away some power.
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