Just like you increase the horsepower on any other car, by adding and changing parts. A few suggestions would be get a better intake, exhaust, fuel, and ignition system. You could add a turbo or a supercharger, or just swap out the whole engine for something bigger.
The 2003 BMW 3-Series's engine produces 184 hp @ 6000 rpm.
The 2003 BMW 5-Series's engine produces 184 hp @ 6000 rpm.
The 2003 BMW 7-Series's engine produces 325 hp @ 6100 rpm.
The 2003 Ford Mustang was rated at 190-horsepower
A massive hammer and lots of money
The 2003 Ford Cobra has 390 horsepower 4.6L DOHC V-8
I believe the 5.4 L in a 2003 Ford F-150 has 260 horsepower
The orifice tube is located in the line at the condenser discharge connection.
I believe that is ( 190 horsepower )
it have 285 horsepower
200 horsepower.
56 horsepower at 9000 rpm