is this the same type of pulley that AMS used to sell long time ago?
is there any gain on NA M113 engines?

http://www.ebay.de/itm/Mercedes-Benz...item35c8ccb80d

I've read sporadic info around the web that the gains are zero, but it makes throttle response a tiny bit better.

I've also read a lot of people claiming that it's bad for your engine long-term, and there's 1 C55k conversion whose AMS pulley failed and ruined the front of his engine.

part looks nice but I don't think I would get one for my car.
there were a few engine failiures on this forum a few years ago when people bought AMS pulleys.

can these aluminium pulleys be compared to Evosport pulleys?
I know there's a reason why factory part is heavy and these aftermarket mumbo-jumbo pulleys are not.

Here is the 'real' AMS, lol:

http://amsperformance.com/