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  1. #1 Pulley drop 
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    I have a stock 04 Grand Prix GTP w/ supercharger. I want to upgrade to a 3.6" inch pulley. I was told that I should get a larger idler pulley with the smaller 3.6 inch pulley.

    Could someone please tell me what size idler pulley I should buy and do I need to get the PCM tuned for this upgrade?

    If I do need to get the PCM tuned, what kind of shop should I go to and what settings should I use?

    Also would I need to buy cooler plugs for this mod, or will standard plugs suffice?

    Thank you in advance
    Last edited by deejayfb; 11-18-2011 at 07:11 AM.
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