They are a 100% copy ripoff of the Unorthodox Under driven crank pulley.
Never had my hand on one. They do not say what the material used is, and if they are like all other OBX products they are not as good of quality as the original.
All OBX does is copy other companies designs and cheapens them and sells a lesser grade product.
obx good or garbage.....?
Are OBX...
OBX Intake Manifold?
And there are pages more.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
really though, in my experience... a pulley is a pulley. ive used the ebay special ones across the board to RSM's stock sized and underdriven sized. had an unorthodox on my 97z and it was no better nor worse than any of the others. one of the only other one's i would like to give a shot to is mike's... and i would have to if i hadnt snagged up an rsm stock sized for $20.
also used the aem alt pulley and mike's alt pulley... both are high quality and get the job done. its just the AEM was not feasible on my car.
Rollin' on question marks since 07.
