There is nothing I love more than made-up drawings of flow, complete with arrows. I once mocked such a drawing by drawing a cube with those beautiful, flowing arrows effortlessly slipping around it.
Volume of exhaust vs volume of surrounding air flow???
I'm more than a little skeptical. Seems to me the placement of the canister re how it is situated in the flow would be the biggest factor. But I'll leave the door open on this one that there could be a little something to it.
I think the main purpose of nonsense like this is to create some hype for this year's "next big thing" thus obsoleting last year's crap and inducing the boy racer types to open their wallets while they dream about that gaining that extra fraction of a second advantage over... who exactly?