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What are the most common modifications and upgrades that can be done to a 1967 Chevrolet SS Chevelle to improve its performance and overall driving experience?

**Rear axle ratio**: Installing a 3.55 or 3.73 rear axle ratio can improve acceleration and overall performance, especially when paired with a manual transmission.

**Headers and exhaust**: Upgrading to high-performance headers and exhaust systems can increase horsepower by up to 20% by reducing backpressure and improving exhaust flow.

**Cold air intake**: Installing a cold air intake can increase horsepower by up to 10% by drawing in cooler air from outside the engine compartment.

**Stiffer springs and shocks**: Upgrading to stiffer springs and shocks can improve handling and cornering ability, especially during high-speed turns.

**Wheels and tires**: Fitting larger, lighter wheels with high-performance tires can improve acceleration, braking, and handling.

**Brake upgrades**: Installing high-performance brake pads and rotors can improve stopping power and pedal feel.

**Transmission upgrades**: Upgrading to a performance transmission with a higher gear ratio can improve acceleration and overall performance.

**Crankshaft and camshaft**: Upgrading to a performance crankshaft and camshaft can increase horsepower and torque output.

**Piston and cylinder head upgrades**: Installing forged pistons and performance cylinder heads can increase horsepower and torque output.

**Engine block and rotating assembly**: Upgrading to a performance engine block and rotating assembly can increase horsepower and torque output.

**Suspension and steering**: Upgrading to a performance suspension and steering system can improve handling and cornering ability.

**Racing stripes**: Adding racing stripes can improve the car's aerodynamics and reduce drag by up to 5%.

**Interior and ergonomic upgrades**: Upgrading to a performance-oriented interior with sport seats, a sports steering wheel, and ergonomic design can improve driver comfort and focus.

**Weight reduction**: Removing unnecessary components and using lightweight materials can improve power-to-weight ratio and overall performance.

**Computer tuning**: Reflashing the engine computer with a performance tune can increase horsepower and torque output by up to 10%.

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