WHEN DO I UPGRADE TO PERFORMANCE HARDWARE?

STAGE 1
Most Stage 1 upgrades are software-based (ECU remap) and work fine with stock components. This normally only takes 2-3 hours at most.
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Stage 1+ can involve hardware upgrades on most cars.
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You can begin with
Performance air filters and cat-back exhausts to enhance gains.

STAGE 2
Essential upgrades include upgrading the exhaust system for better airflow and an air intake, intercooler, and sometimes a fuel system. This will all allow for increased air and fuel.
These hardware upgrades are crucial and aren't optional at stage 2.

STAGE 3 & 4
These can vary per car but most of the time its an upgraded turbo/supercharger for more units of boost. Advanced fuel systems and cooling (such as high-pressure fuel pumps and meth injection) along with engine internals/transmission upgrades.
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At stage 3 its optional but definitely recommended to upgrade your braking system and suspension.
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PERFORMANCE HARDWARE EXPLAINED

AIR INTAKE SYSTEM
Purpose: Increases the amount of air flowing into the engine, improving combustion efficiency.
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Why upgrade? A performance air intake or filter allows more oxygen-rich air to enter the engine, resulting in better throttle response and slight power gains. Essential for optimizing airflow in higher stages of tuning.

EXHAUST SYSTEM
Purpose: Removes exhaust gases from the engine more efficiently, reducing backpressure.
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Why upgrade? Upgrading to a performance exhaust (like a cat-back or turbo-back system) improves engine breathing, enhancing power and torque. Crucial for higher stages, where the engine produces more exhaust gases due to increased power.

INTERCOOLER UPGRADE
Purpose: Cools the compressed air from the turbocharger or supercharger before it enters the engine.
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Why upgrade? An upgraded intercooler prevents heat soak, maintaining consistent power output, especially under sustained high boost in Stage 2 or 3 tuning. It ensures cooler, denser air reaches the engine for better performance.

FUEL SYSTEM UPGRADE
Purpose: Supplies the engine with the necessary amount of fuel for combustion.
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Why upgrade? In higher tuning stages, the engine demands more fuel. Upgrading fuel injectors and pumps ensures that the engine gets the fuel it needs, preventing lean conditions that can damage the engine.