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The use of a bell mouth on intakes is widespread. Any throttle body setup will use a bell mouth/velocity stack/trumpet on each individual runner.

What surprised us about this video is the massive effect a bell mouth has on the effectiveness of an intake.

The conclusion of this video is that by adding a bell mouth to an air filter is similar to doubling the size of the air filter.

Or to put it another way, removing the bell mouth from the end of the intake is equivalent to almost halving the size of the air filter.

In short the results of this test are remarkable. We knew bell mouths were effective but we underestimated just how essential they are to the performance of an air filter and the intake system in general.

Street & Circuit, Hellas.

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