how much more wear do 2,3,4# pullies really put on the chargers?

im trying to make a decision, although sometime i do plan on purchasing a kb, or works, but in the meantime i would like to somewhat limit the wear on my sole supercharger. i would like to hear yalls input on bigger pullies.

 

26,000 miles with 2# lower and 2# upper, then 14,000 miles with a 6# lower and the same 2# upper. The stock blower has run perfect and is still going strong at allmost 42,000 miles

 

thanks don, i think i will go with a 4#er. but i was thinking, while i was going to have my heads ported by my buddy i was also going to have him plug those pesky 4 bottom blower holes that sacrifice blower effeciency for noise level ( i like my charger too be noisy anyways seeing how i dont drive very far in my L anyways) any idea how this will improve effeciency? does it give more boost? or just make the charger easier to turn? or make it just run cooler? well once again i anxiously await everyones input