Easiest/cheapest way for a few more horses are an upgraded performance carb/intake (Holley/K&N, etc) and a less restrictive exhaust (high performance muffler, etc). Then they start to get more expensive - superchargers/turbos, etc.
To see significant horsepower gains, the way to go is forced induction (turbocharging or supercharging). not every engine can handle forced induction, though.
245 10 more than the 318
A general rule is the bigger the engine, the more horsepower.
Horsepower is not dependant on engine size, but on engine efficiency and RPM, more information is needed to answer this question.
You can't get much more than what it comes factory unless you put a chip in it or re-do the whole engine
Be more specific. An sticker from a bubble gum machine can be called an "upgrade" to the exterior, just as a colored light will "upgrade" the interior.
Compared to the V-6 or V-8 2010 Dodge Ram 1500 model, the Ford Ranger's engine is smaller, with an inline-4 or V-6. Dodge Ram has the edge in horsepower, torque and performance, with the Ram 2500 even more powerful.
allows more air into the engine and engine compartment. this allows for potentially more horsepower.
more horsepower on the magnum
Depends on the engine that is turning 1,000 rpm's. A larger engine develops way more horsepower than a small engine at 1,000 rpm's.
Install a computer chip upgrade to improve fuel injection and ignition output. This is the most "efficient" way to add 50 horsepower. The quick and dirty way to add more horsepower is nitrous oxide. Putting the motor on a single-stage NOS bottle will raise horsepower, but threaten the viability of the engine.
The brake horsepower (BHP) of the average 50cc scooter engine is about 3 to 4. In most states, any engine with more than 5 horsepower must be registered as a motorcycle.