A lightened pulley if made correctly should not give you any issues. Where the issues arise is in undersized pulleys.
A) The bearing failure is a result of the belt pulling on the crank to tightly causing premature wear. (This IS why all our Honda friends who use serious engine setups use stock crank pulleys.... I.E. Lisa Kubo 9.28 1/4 mile in an eg6 h/b boosted 1.8DOHC, Kenny tran, Stephen Papdakis, Bizimoto.. ect)
B) the flip side is if you plan on running any extensive Audio systems in your cars, i dont suggest pushing beyond 225-250W system. And i mean unregulated Power supply amps like old style Kicker/Phoenix gold/Xtant/Eclipse/ ect ect...
otherwise a lightened pulley should net you anywhere between 5-9 hp depending on engine. And im stating that at the fly not the wheels. At the wheels is possibly a 2-3 hp gain possibly but the smoother top end is where you notice it the most.
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