Reducing the gap on spark plugs, especially in performance cars, is often done to ensure a consistent spark under high-pressure conditions. In high-performance engines, especially those with forced induction (turbochargers or superchargers) or high compression ratios, the cylinder pressures are much higher than in standard engines. This high pressure can make it more difficult for the spark to jump a larger gap.

Reducing the spark plug gap to something like 0.020 inches can have several benefits in these conditions:

1. Improved Ignition Reliability: A smaller gap can ensure a more reliable spark in the high-pressure environment inside the combustion chamber. This is crucial for maintaining engine performance and preventing misfires.

2. Stronger Spark: A smaller gap can lead to a stronger and more concentrated spark, which can be beneficial for igniting the air-fuel mixture more effectively in high-performance engines.

3. Enhanced Durability: In high-performance applications, the intense conditions can degrade spark plugs more quickly. A smaller gap can reduce the stress on the spark plug, potentially leading to longer life.

4. Reduced Misfire Risk: With turbocharged or supercharged engines, the risk of spark blow-out (where the pressure in the cylinder blows the spark out before it can ignite the fuel) is higher. A smaller gap can mitigate this risk, ensuring consistent engine performance.

5. Compatibility with Power Adders: Engines with power adders like nitrous oxide systems can benefit from a reduced spark plug gap to ensure the spark is strong and consistent, given the additional combustion pressures and temperatures involved.

However, it's essential to note that changing the spark plug gap from the manufacturer's recommendation should be done with caution and typically with expert advice. While a smaller gap can offer benefits under certain conditions, it might not be suitable for all engines or situations. Adjustments should consider the specific engine setup, fuel type, and the intended use of the vehicle (e.g., racing, street performance). Also, too small a gap could potentially lead to other issues, such as reduced power output or fuel efficiency under normal driving conditions, due to less effective combustion.

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