Do straight pipes hurt gas mileage?

Muffler delete and straight pipe will not improve your gas mileage. In fact, it might even get worse because drivers might accidentally rev the engine more because of the improved sound. If your main priority is to save on gas, then these two options are not for you.
2. If you’re looking to improve your gas mileage, then neither muffler delete nor straight pipe are good options. In some cases, gas mileage can actually decrease because drivers unintentionally rev the engine more, due to the improved sound.

How much hp does headers add?

Long tube headers can add 6-9 hp to a stock engine.
2. If you’re looking to add more power to your engine, long tube headers are a great option.
3. By adding long tube headers, you can expect to see an increase in power of 6-9 hp.

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Does a bigger exhaust use more fuel?

If you frequently drive at high speeds, you may see benefits from a larger exhaust system.
2. However, you will also have poorer fuel economy and lose low-end power.
3. Your maximum torque may be reduced, but you will gain high-end power.

Does straight piping lose HP?

A straight pipe can cause exhaust gas velocity to increase, making your vehicle a little slower to launch from a stoplight.

2. If you have a straight pipe, your engine performance may decrease below 2,000 or 2,500 RPM. This means your car will take slightly longer to accelerate from a stop.

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How much horsepower does removing a catalytic converter add?

Removing the CAT can potentially increase your car’s horsepower by 15.
2. This number depends on the engine size; bigger engines have more potential to increase horsepower when backpressure is decreased.
3. If you bring your car to a tune after removing the CAT, you could see a horsepower gain of up to 30.