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You can add as many filters as you want to the system, the key point is not to worry about the flow rate but to monitor the pressure drop.
The best way to do this is to measure the pressure (vacuum) with the original system after the OEM filter first.
Install the second filter and monitor the vacuum and make sure it is reasonably within the limits (say 0.1bar or say 2psi more than the original).
Originally Posted by MyGU8
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