keeping the conversation to stock cars isn't realistic. Majority of Mustang owners have the stock exhausts off before putting the first 20 miles on the car. However I think you are all overlooking the fact that it is a 5.0 aluminum block. The new shelby350 added a roots blower and they are "in the realm of 500hp" which is only about 88hp over stock. Ford understands that they can't put an engine in the GT that will out power their GT500 for a fraction of the price, Nissan puts forth no such limitations. They aren't competing with other cars in their lineup but rather cost, safety, and engineering standards.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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