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Does anyone make an underdrive pulley for the b12? If not, does a pulley for the b13/14 fit the b12?
 

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The Motorsports pulley only works on E-series motors and they are really only designed for B11/N12 models. The pulley has a V-belt groove instead of the serpintine groove used in the later models. In order to make the pulley work, you have to use an older water pump pulley and have an alternator shop put a new pulley on your alternator.
 

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I think the Unorthodox Pulley for GA16DE will fit the GA16i engine. Even if it fits, gain is pretty small(1-2hp, check Nissan Perf Mag) and does not warrant the cost of the pulley which usually retail $280 CDN ($150 US). Gain might be different with GA16i though.
 
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