I am interested in replacing my Kelisa's three-belt pulleys with the after market alloy type. I understand that it will be much lighter on acceleration compared with using the original metal type. Is it a good a idea to change?
The alloy pulleys will definitely look better but your car is not going to go any faster! I cannot see how weight you can gain by the replacement of these parts but of course, the people selling it to you will show you documents to say that this is so.