4WD Snorkels and increasing engine airflow (your Q&A - contains nut)

In this report, I answer the following question:
“I was sitting around the campfire just next to Dingo Piss Creek talking to a guy about his LS powered GU Patrol. He explained that it was making around 200kw at the wheels on a dyno, but mentioned that he had to replace the regular 'Safari' style snorkel with a custom 4" stainless steel snorkel so that he could gain more air flow to make those numbers. 

“How is that possible if snorkels don't increase air flow? PS my 4WD is fitted with a snorkel, and besides that fact that I've done Cape York, Arnhem Land and the Victorian High Country in it, it makes me feel really tough when I pull up to the Woolies carpark to pick up my supply of toilet paper, YEEEEESSSSSSS” - Sam

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