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Hey guys I was wondering if anyone has had good experiences with the underdrive pulley or the whole set and if you have noticed any problems with them because I am definately lookin for a power booster so I wanted to know if they work and what kind of negative effects they have if any? Thanks

 
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I have heard that the underdrive pully works but I have only heard bad things about the other pullies. Something about they make your alternator, power steering and a/c spin at a speed that the car doesn't like and can cause the car to stall.

 
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http://www.7thgencivic.com/forums/search.php?s=

You will find many topic about this already.

 
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I have the entire ur pulley set... I love it! I forgot to review them, I couldn't figure out how to do it and so I gave up...

But they gave me a good increase in power, and great low-end torque... I promise you'll like them... It's worth the 440 installed...

 
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The pulley (I have just the crank) is really THE BEST gains I have noticeably seen from my car yet! The header, AEM pulleys or AEM SRI did not produce what this part did. It is a pain to install so I had to take it into the shop, but this gives good low end power esp if you are an auto trans like me (yes, big mistake I know). Best part you can get!

 
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I have unorthodox crank pulley and aem underdrive pulley. Low end greatly increases...good for those who have mod their exhuast which decrease the low end...
If you floor it, you will hear a different sound start from 3000rpm...