30
500 horsepower
The 3.7 liter V6 in a 2012 Ford Mustang is rated at ( 305 horsepower )
315 horsepower
210 horsepower I believe
190 horsepower
It depends what customizations a person has made on their car, but a stage 3 Roush would destroy a GT. A GT (at least for 08) has a 4.6L engine and a Roush (428r) has a 4.6L engine along with the Roush Super Charger, Roush Suspension, Roush Breaking, as well as many other smaller differences. Overall a Roush is much better than a GT because what the Roush company does is purchase GT's and then upgrade a lot of it.
not enough
Depends on the year of the mustang, but the 2005 one ran 300 horsepower and ended with 315 in 2010. Many automotive sites, including autos.msn.com, will tell you how much horsepower any vehicle has.
The 3.8 liter V6 has 190 horsepower ( the 4.6 liter V8 in the 2000 Ford Mustang GT has 260 horsepower )
315 horsepower
I believe the 2000 Ford Mustang GT has ( 260 horsepower )
( 412 horsepower ) if using " premium " unleaded , 91 octane or higher