Adding 50 hp to your car is not an easy task and will most likely require some modification to your car's engine. However, there are a few ways that you can increase your car's horsepower. One way is to install a larger turbocharger or supercharger. Another way is to add a nitrous oxide system, which can give your car a significant power boost. You can also increase the displacement of your engine by increasing the bore and stroke. These modifications will all require professional installation and tuning, so make sure you consult with a qualified mechanic before making any changes to your car's engine.