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I have seen alot of pulleys for the celica gts, like the AEM True-Power Pulley Kits,Unorthodox Racing Underdrive Crank Pulley,Unorthodox Racing 6-Rib Alternator.

I have seen on the installation guide where the AEM pulley is placed on the alternator, they claim a gain of 6-12 HP, is this without changing ECU settings?

and if the gains are so great whay are'nt many people using them?
does all of them attach to the alternator? and which is best?
 

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AEM alt pulley gives 1 HP at best.

Unorthodox makes a 3 pulley set that give around 11-12 WHP but they are known to cause SERIOUS engine failure.

JOHNNY GTS makes replicas which address the design faults of the orthodox and gain slightly less but retain reliability. 7-9 WHP.
 
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