This mod replaces the factory airbox and air filter with a larger, less restrictive air filter and a longer intake pipe that draws cooler air from outside the engine bay. This increases airflow to the engine, which boosts power.
This mod replaces the factory intake manifold with one that has larger, smoother runners that increase airflow to the engine. These are especially important for maintaining the car’s OEM reliability records, so be sure to go for one that boosts power but in a controlled and dependable manner.
These mods reprogram the car's computer to optimize engine performance. These benefit your horsepower, torque, and throttle response. It’s best to combine these with mods such as cold air intakes and more free-flowing exhaust systems in order to perfectly set up your software and hardware mods.
Upgrading the exhaust system can improve engine efficiency and increase horsepower. This can be achieved through the installation of a performance exhaust header, high-flow catalytic converter, and performance muffler. If you want to go all out, you can replace all of these, but you can also be sensible and keep some of the OEM exhaust system pieces in place.
The legality of car performance modifications varies depending on the specific modification and the location where the car is being driven. Some performance modifications may be illegal in certain areas or countries, while others may be legal but require certification or approval from a regulatory body.