If you want to increase the engine-power, you've essentially got to find ways to move more air in a greater volume through your engine. There are some ways given for increasing engine power.
1. Installing a High-Performance cold air intake to increase engine horsepower.
2. Installing a High-Flow air filter and intake.
3. High Performance Exhaust System.
4. Supercharger.
5. Turbocharger.
6. Nitrous.
7. Water-Injection Kit.
8. Performance Camshaft.
9. Reflash your vehicle’s computer.
10. Keep your filters clean.
11. Keep your car well lubricated.