I have spoken to few guys but none had any idea of duties on ford mustang, so I am going to calculate it in my own way keeping in mind the price etc.
Ok here are prices for brand new ford mustang in USA.
4.0 $20,000
4.6 $27,200
GT Shelby 5.4 $50,000
Lets take the price of GT, which is $50,000, add $5,000 in shipping and another $1,000 in miscellaneous (insurance etc).
So the GT will have a price tag of $57,000 at Karachi as brand new. Duties would be like this
$57,000 x 75%=$42,750 (customs duty)
$57,000 + $ 42,750= $99,750 x 15%=$14,962.25 (sales tax)
$99,750 + $14,926=$114,712.25 x 6%=$6,882.73 (income tax)
$114,712.25 + $6,882.73=$121,594.98 x 7.5%= $9,119.62 (CVT)
So total duties are
$ 42,750+14,962.25+6,882.73+9,119.62
=$73,714.60
Now convert $ with rupees ($1=Rs60)
73,714.60 x 60= Rs 4,422,876
So duty on a brand new Mustang GT Shelby would be around Rs 4,422,876, add another Rs 100,000 in other charges.
And if you bring a two or more than two years old GT Shelby (under 5 years old) duty would be half of above-mentioned amount.
By using this formula you can calculate duty of all other cars.
PS: I have taken the vehicle prices from a US website and since US is manufacturer of ford mustang, its price would be taken from there.