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Message: <blockquote data-quote="NXcoupe" data-source="post: 613694" data-attributes="member: 11751">ON a Kenne bell it has to be draw through because the blower shoots the air directly into the engine via the intercooler under it in the intake manifold. A blow through is like procharged or intercooled car that has the mass air in the piping, and the air, well, blows through it as it enters the engine.  With a KenneBell, there is no need to worry yourself with a blow through or draw through, they only use a draw through. Their bypass is made into the rear of the blower and when it sees vacuum, it allows the pressure from under the blower to route back up into the intake plenum on the rear of the engine. I am a KenneBell dealer and have installed several, so if you have any questions feel free to pm or just post here. As for the insert, I believe it is a vacuum restrictor or something of that kind, that keeps subtle changes in vacuum signal from affecting the computer's decisions in controlling timing and fuel. That's what causes surges and other problems. Hope this helps.</blockquote>