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That guy
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Why not just get the biggest pulleys you can jam in the stock cage.
That's 12/14t there... Fit in 10s Red cage with no modification, but had to hack the pins on the 9070. Gives some improvement and looks way better than the goofy and expensive aftermarket cages IMO.
Found the pulleys on eBay, IIRC... These ones are narrow/wide. Resin is the go, ally ones are noisy.
Part of why I reckon it looks better than stock is the extra clearance has been fettled away; the pulleys barely miss each other.
Just found this which is a different manufacturer to mine and looks better made despite being about 1/3 cheaper these look like the UT branded ones. Mine is branded J&L but i think his points apply to most of these ali/ebay versions
https://youtu.be/y7HRWYM-pUs