ITG Foam Air Filters - for Reverie Air Boxes

ITG Foam Air Filter - Reverie Zolder 112/150

ITG Foam Air Filter - Reverie Hockenheim 422/Interlagos 425

ITG Foam Air Filter (Increased Height) - Reverie Hockenheim 422

ITG Foam Air Filter (Single) - Reverie Hockenheim 405 - V6 & V8

ITG Foam Air Filter (Double) - Reverie Hockenheim 405 - V8

Inlet Sizing

An inlet that is too small will cause a pressure drop inside the air box restricting performance. The inlet sizing guide (below) shows the minimum recommended inlet and ducting size for a power output category. The larger the power output of an engine the more air it will require to run at peak efficiency, therefore a larger inlet pipe/duct is needed as power increases. Multiple smaller inlet pipes/ducts can be used to achieve the same open area as a larger inlet, for example, if a larger inlet pipe/duct won’t fit on the air box, multiple smaller pipes or oval inlet pipes could be used to create a comparable open area. High flow alloy straight trumpets can also be used as intakes.

On typical engines 150CFM is required for each 100BHP

On high performance engines 130CFM is required for each 100 BHP

The formula below shows the formula for required airflow to the engine in cubic feet per minute.

CFM = Engine Capacity (Cubic Inches) / 3464  * Max RPM

1L = 61.0237in³

For example a 5.7 litre engine requires 703CFM of air at 7000rpm :
703 CFM = 347.84CI / 3464 * 7000RPM

Or if supercharged...

CFM = (CI * RPM / 3456) * (boost [psi] / 14.7 + 1)