Measured restriction to intake air path by snorkel/RAI
	
	
		After fitting my sealed system from front guard to air filter box I did a quick test - covering the intake grille at the front guard to see how well sealed it was. 
The 90mm duct tried to implode but the engine kept running.  Didn’t test more as I got a bit sus about the standard hose that seems to go from the top cover of the engine to the air intake hose between air filter and turbo.  Maybe blocking the air intake at the front guard would cause increased suction on crankcase and potentially expose the turbo to more oil than acceptable. 
All purely speculative and something to validate one day. 
Today I stumbled on this!:
Bas Remaps - I think I MUST be the first to go this in... | Facebook
Interesting read!
”...So that is that then..   KBX and snorkels ARE restrictive and cause more vacuum draw on the crank case which is the nearest point to the turbo inlet and without a shadow of doubt can con tribute towards oil in the compressor housing of the turbo and a difference in power to a non snorkel car.”