I don't have mine yet but AFX is 30% underdrive, the UR is only 20%. Plus the UR weighs like 3 or 4 lbs and I think the AFX is around 1 to 2lbs. I don't know what the UR is made of but the AFX is made of Alum.
KYB AGX Struts Neuspeed Sport Springs 5 Strut Bars (2 F/U, F/L, R/U, R/L) Sprint Front Camber Kit $15 Rear Camber Kit Ported Intake Manifold Ported Throttle Body Custom 2 1/4 inch exhaust Empty Catalytic Convertor 225/50/16inch Wheels and Tires
Flame Red SRT-4 GT40,8.5:1 Built Shortblock, Brian Crower Stage 2 Cams, etc etc etc...
there is no difference just price ! Just remember in the aftermarket world u get what u pay for.. my belts are perfect and i havent read one post about an unorthadox pulley eating belts as a matter of fact my belt line is still in pristine order
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