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What are the best performance upgrade parts for a 2017 Subaru Impreza Sport?

**Cold air intakes**: Installing a cold air intake can increase horsepower by 5-10% by drawing in cooler air from outside the engine compartment, which is denser and contains more oxygen molecules, allowing for more efficient combustion.

**Turbocharger boost pressure**: A turbocharger can increase an engine's power output by up to 40% by compressing air, which allows more oxygen to be drawn into the engine, resulting in a significant increase in power.

**Suspension modifications**: Upgrading the suspension can improve handling by reducing body roll, which allows the vehicle to take corners more smoothly and maintain traction.

**Aerodynamic drag**: Adding a front splitter or rear diffuser can improve aerodynamics by reducing drag and increasing downforce, allowing the vehicle to accelerate faster and corner more efficiently.

**Engine tuning**: Reflashing the engine's computer can increase power output by up to 20% by optimizing ignition timing, fuel injection, and boost pressure.

**Intercoolers**: Installing an intercooler can reduce the temperature of compressed air by up to 50°C, increasing the density of the air and allowing for more oxygen to be drawn into the engine.

**Weight distribution**: Distributing weight evenly between the front and rear axles can improve handling and traction by reducing understeer and oversteer.

**Tire compound**: Using high-performance tires with a softer compound can improve grip and handling by increasing the coefficient of friction between the tire and road surface.

**Brake cooling**: Upgrading the brake system with high-performance brakes and cooling ducts can improve stopping power by up to 20% by reducing brake fade.

**Roll stiffness**: Increasing roll stiffness by adding stiffer springs and anti-roll bars can improve handling by reducing body roll and increasing cornering speed.

**Downforce generation**: Adding a rear spoiler or wing can generate up to 100 kg of downforce at high speeds, improving stability and traction.

**Torque distribution**: Implementing an all-wheel-drive system can improve traction and acceleration by distributing torque to all four wheels, reducing wheelspin and understeer.

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