3-5 horsepower
From 5 to 10 horsepower.
In diesel engines, yes. In gasoline engines, not much.
Depends on which cold air intake you install. Some years back, SCC did dyno testing with a wide range of aftermarket short-ram/cold-air intakes. I believe the highest horsepower gains were attained with Injen and AEM. During the warmer months, an advantage of using a cold air intake is to prevent horsepower loss from elevated engine bay temperatures.
install aftermarket mods such as air intake, exhaust, and even turbo down the line if u feel inclined to.
you wont gain any horsepower, you will just gain more noise
Installing an aluminum intake can potentially increase horsepower by optimizing air flow into the engine, but the effect will vary depending on the specific vehicle and its engine characteristics. Other modifications and tuning may be necessary to fully capitalize on the potential horsepower gains from an aluminum intake.
10 horsepower.
about 2 wheel horsepower
A 2000 RMX 250 has a horsepower of 58. This is based on the basic edition motorcycle. Should aftermarket performance parts be added the actual horsepower of the motorcycle will increase.
aftermarket intake (K&N, for example) and aftermarket exhaust system are the two easiest ways. you could also... install a turbo or supercharger use a 'powerchip' type computer upgrade
God, where to start? there are a LOT of things you can do to add horsepower. How much money are you looking to spend? here's a list of things you can do: cold air intake, swapping exhaust manifolds to headers, changing to a high flow exhaust system, turbo/supercharger, nitrous, aftermarket computer chips, lightweight camshaft gears, bigger camshafts, bigger engine, aftermarket clutch, aftermarket torque converter, etc.etc.etc.etc. There's a helluva lot you can do. It's all in how much money you wanna spend. Agreed. LT headers/cold air intake/catback/tune REALLY wake these bad boys up though