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are they really worth gettin..does anyone have any installed? that have seen a significant notice? i was thinking about gettin em....the price tag isnt so bad , im all about performance..anyone ???[???:)]
 

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they will make a difference on the zetec im not sure about the svt im sure they do.....
 

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Why are you asking this in the SPI forum?? If you're asking for an SPI, then there are a few UDP's out there. I have the AEM alt. UDP. It is the same as the one for the ZETEC. Make a difference? So-so. It revs a little faster, but nothing stellar. I also have the Black Diamond Racing crank UDP. It made a nice difference for me. They also offer a 50% UDP if you want to go that route.
If you're asking for an SVT, you're in the wrong forum.
 
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