Pulley wanted

Quick question if i go to a Modular pulley system is it going to be an 8 rib pulley an if it is what will I half to do to run an 8 rib pulley
 
replace all your pullies. what are you looking to get out of your car? i just changed to a 3.0 puley and i have a 3.25 mounted on a snout for sale. what mods do you have to support a smaller pully
 
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