I will second that.
If you want a light weight pulley, stick to one that is stock diameter.
The SVX uses same pulley as the Impreza doesn't it???
I had a Perrin Lightened Crank Pulley on my Impreza. It weighed 1.2lbs and made the engine rev much faster.
Here are links to Impreza pulleys:
http://www.horsepowerfreaks.com/perf...Engine/Pulleys