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Yeah, of course it does. The top pulley reduces the angle by 1/12th, and the bottom reduces it by 3/14ths. I think - I might be a bit too stoned to be sure.
Bigger pulleys, less angle. There's more wrap than you'd get with a longer cage like the upgrade kits, but I'm pretty sure that counts for jack shit, it's just the articulation angle that matters.
BTW, these pulleys I bought off eBay specifically to jam in my Red derailer, which took them with no modification. Different story with the Dura-Ace number, had to cut off one pin and go more than halfway through the other one.
Kimmo
hippy
Does that actually do what it's supposed to? ie. reduce the chain angles