The harmonic balancer prevents your crankshaft from excessive vibration at high RPM's. Since Celicas rev fairly high, it's a good way to go ka boom.
ya think about it when ur engine is spining at 7.5k rpmz the slightest improper balance hurts ur engine...i would go with AEM
[/quote]Also not to mention that your AC and other accessories take a blunt effect from it too. They will be underpowered from what I hear.
UR pulleys are meant for cars with a lot more HP than a Celica if you ask me. Just doesn't do much but cause problems.