I can see the G37 seeing bigger gains than the Z just due to the nature of the car, sports car vs. luxury performance. I could be wrong but I do believe the G offers slightly less hp from the factory than the Z and a lower Rev limit?
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2010 Ford 6.4L Power Stroke Diesel: 588whp/1082wtrq
2007 Dodge 6.7L Cummins Diesel: 788whp/1405wtrq, runs 12's @ 7400lbs, Still miss my 370z!
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