mostly use MARCH 13031 on most builds here,they look like they have same pulley for less, never purchased this brand but saw them,if get a chance to try one wouldnt hesitate to do so.
http://www.hkmotorsportsdynoshop.com/
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someone who thinks logically is a nice contrast to the real world.
http://www.youtube.com/watch?v=3FfKVVZW1-Y