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What are the best modifications for a 2018 Subaru WRX with 19,000km to improve performance and handling?

Engine remapping can increase horsepower by up to 20% by optimizing fuel injection and ignition timing, as the factory ECU settings are designed to balance performance, fuel efficiency, and drivability.

Cold air intakes can increase airflow by up to 30% by drawing in cooler air from outside the engine compartment, resulting in increased power and torque.

Exhaust systems can reduce backpressure by up to 50%, allowing the engine to breathe more efficiently and increasing power output.

Suspension upgrades can improve handling by up to 25% by reducing body roll and increasing grip, as the stock suspension is designed for comfort rather than performance.

The GrimmSpeed boost control system can increase boost pressure by up to 10psi, resulting in significant power gains, by allowing for precise control over engine response.

The factory airbox restricts airflow by up to 20% compared to an open intake, which can increase power and torque by allowing for more efficient airflow.

The Subaru WRX's FA20 engine produces 268 horsepower, but can be increased to over 350 horsepower with modifications, making it a highly tunable engine.

The ECU (Engine Control Unit) is the brain of the engine, controlling fuel injection, ignition timing, and boost pressure, and can be remapped to optimize performance.

The 2018 Subaru WRX has a curb weight of 3,300 lbs, which affects its power-to-weight ratio, making modifications to reduce weight or increase power essential for improved performance.

The WRX's all-wheel-drive system can transfer up to 40% of torque to the front wheels, affecting handling and traction, and modifications can optimize this system for better performance.

Turbochargers can increase power output by up to 50% by forcing more air into the engine, resulting in significant power gains, but also increasing heat and stress on the engine.

The Mishimoto front-mount intercooler can reduce intake temperatures by up to 20%, resulting in increased power and efficiency, by providing a more efficient cooling system.

The IAG series AOS (Air-Oil Separator) can reduce oil consumption by up to 50% by separating oil from the intake air, resulting in improved engine longevity and performance.

The Turbo XS catless j-pipe can reduce backpressure by up to 75%, allowing the engine to breathe more efficiently and increasing power output.

A performance-oriented catback exhaust system can increase power output by up to 10% by reducing backpressure and improving exhaust flow, resulting in a more efficient engine.

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