That said, here are some components commonly removed for performance or simplification, with strong caveats:
* Air Injection System (AIR): This system pumps air into the exhaust manifolds to help burn off unburned fuel. Removal often involves disconnecting the air pump, hoses, and related vacuum lines. Caution: This can increase emissions significantly.
* EGR (Exhaust Gas Recirculation) System: This routes a portion of exhaust gases back into the intake manifold to lower combustion temperatures. Removing this often involves disconnecting the EGR valve, vacuum lines, and related plumbing. Caution: This can lead to increased combustion temperatures and potential engine damage. It will also increase emissions.
* Catalytic Converter: This is a critical emissions control component. Removing it is a serious violation of environmental regulations in most places and will dramatically increase emissions. Highly discouraged.
* Charcoal Canister (Evaporative Emission Control): This system captures fuel vapors and prevents them from escaping into the atmosphere. Removing it will involve disconnecting the vapor lines and the canister itself. Caution: This will result in increased hydrocarbon emissions and likely fail an emissions test.
* Vacuum Lines: Many vacuum lines are dedicated to emissions control components. Removing these lines (without understanding their purpose) will disrupt the proper functioning of the engine.
Before removing ANY emissions component:
* Check your local laws and regulations. Removing emissions parts is often illegal and can result in fines.
* Understand the potential consequences. Removing parts can negatively impact engine performance, fuel economy, and longevity.
* Consider the environmental impact. Emissions contribute to air pollution.
If you're aiming for improved performance, focus on modifications that don't involve removing emissions components. Upgrades to the intake, exhaust (within legal limits), ignition, and carburetor/fuel injection system are safer and often more effective. For a purely off-road, non-street legal vehicle, the regulations might be relaxed, but still consider the impact on engine reliability. Even then, carefully research which components can be removed without causing significant issues.
