Nugget Stuff Airbox into Defender Puma

There is certainly increased air flow. The original pipework is the equivalent of approx 75mm diameter pipe. The kit has 90mm pipe and a larger surface area filter.

These engines like a LOT of air. The other restriction is any RAM head/prefilter that draws from underneath.

Must be a factory problem with the CAT as mine fell off too!!! :)

Quote:

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Originally Posted by Toxic_Avenger

Could be achieved for under 10 bucks - a differential pressure gauge (water Manometer) using some clear plastic tube and a plank of wood to mark a scale on would give you a point to point pressure differential.
Measure mm of H2O and can easily convert this to psi / kPa, or your chosen flavour of pressure units
In this particular instance, put a barb fitting into the filter indicator hole, and one in the snorkel inlet. make sure the hose run is long enough so as not to get a filter full of water...

https://www.efunda.com/formulae/flui...anometer_A.gif

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Mitch - you give me too much credit to even understand your diagram let alone put it into practice.