Would a 2005-2009 mustang with lambo doors look better with racing stripes or worse?
Neither. Leave American muscle alone, if you want Lamborghini doors.. buy a Lamborghini. Or put them on an European Car.
Stripes is fine on a Mustang, many mustangs come with very nice stripes. On a Silver Mustang GT.. black, blue and red look awesome. If its a darker Silver, white looks great too!
A Lamborghini door kit costs around $1000, with that money you could buy a SRI or a CAI, A new Exhaust system and get it tuned with money left over for gas.