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jackal is right, if it throws a code you will need a crank or what gm calls a C.A.S.E. learn, any dealership will do it and it normally runs about $30. I havent heard of many needing that though. One thing to remind you of though, you need to transfer the 24x sensor ring from the back of the stock pulley onto the new one, its not hard, just 3 little screws and a bit of anti sieze. The ffp will come with directions on this. and alero is correct it is a 1" shorter belt. I have 2 500 rms 1000 peak amps with the ud pulley with no issues, have had the pulley on for 2 years now.
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