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Looking for more output at idle from ANY alternator on your 1999-2012 GM truck or SUV ??? Look no further !!! We will soon be stocking OVERDRIVE harmonic ballancers for LS series GM trucks and SUV's with 4.8L, 5.3L, 6.0L, and 6.2L engines, 1999 through 2012. This replacement ballancer has a larger diameter 8 rib crankshaft pulley on it. This means that your alternator or alternators will be spinning 10% faster at idle, which can mean a 50 to 100 amp increase at idle, depending on which high output alternator(s) you have. If you are running multiple high output units and have a problem with belt slip, we also offer an 8 rib conversion that comes with everything you need to swap to an 8 rib belt, increasing belt traction and idle speed at the same time !! (alternator pulleys sold separately) On top of that, we will also be stocking SCT and Diablosport handheld tuners. These devices upload a high performance tune to your vehicle's engine computer that increases HP, and ALSO allows you to increase your engine idle speed to up to 1,000 rpm. The combination of a tuner, crank pulley, and our 370 amp Elite series unit would result in over 300 amps at idle !!! Watch for demo videos soon!!