It's your car so do what you want with it. I can't think of a better car to learn on myself. You see these old farts driving around in their pristine 66GT's and such, but if it were mine it wouldn't be stock that's for d@mn sure. Who cares if it depriciates the value. When I buy a car it's not to make money off of it by selling it 10 years later. It's to make it go fast and have fun with it.
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90 Mustang LX 5.0
My Ride*
My Site