Here's my interpretation on 'The Blade'
Its a thick fabric that the exhaust gas passes through.
It causes increased backpressure.
The increased backpressure causes more exhaust reversion during overlap and therefore more 'natural EGR' for want of a better phrase.
The increased 'natural EGR' increases cylinder temperatures and therefore decreases catalyst lightoff time.
The increased 'natural EGR' means that for the same power outputs, the throttle position has to be greater to achieve the same intake airflow (i,e, to get the same amount of air & fuel in there).
You can get the same effect by fitting a couple of socks over your tailpipe or squashing the end down a bit!
Oh, and it collects carbon out of the exhaust that would normally justg drop out of the tailpipe in chunks
Wow, big deal..... hardly saving the earth.
I'm calling snake oil LOL