Do Shorty Headers Increase MPG?
The age-old debate about whether shorty headers can boost your car's gas mileage continues to spark conversations among automotive enthusiasts. Shorty headers, due to their shorter length, are often favored for their ease of installation and aesthetics. However, the impact these headers can have on a car's performance, including gas mileage, can vary widely depending on several factors. In this article, we will explore the potential effects of shorty headers on your car's efficiency and performance.
Boosting Gas Mileage with Headers
Shorty headers are designed to improve exhaust flow by reducing backpressure. According to some sources, shorty headers can increase gas mileage by 5-10%. This improvement occurs because reduced backpressure allows the engine to produce higher output with less resistance, potentially leading to better fuel efficiency. However, it is important to note that these claims are highly variable and depend on numerous factors.
Realistic Expectations for Shorty Headers
It is essential to approach these claims with a realistic mindset. While some argue that shorty headers can indeed improve gas mileage, others are skeptical, suggesting that any potential gains are minimal and not universally applicable. In many cases, shorty headers may offer a slight power boost, but this is not a guaranteed outcome. Additionally, purchasing shorty headers requires careful consideration, particularly regarding legal compliance.
Legal Considerations
Before installing shorty headers, it is crucial to ensure that they are 50-state legal. Not all headers are compatible with every state's emission regulations, and installing an illegal header can result in significant penalties. Always research and verify the legality of your chosen headers to avoid any legal issues.
The Impact of Headers on Modern Cars
The effectiveness of headers, including shorty headers, can vary significantly based on the car and engine type. In many modern vehicles, the impact of headers is limited due to the advanced tuning of the Powertrain Control Module (PCM). These modern computer systems are designed to optimize gas mileage and performance, often negating the potential benefits of headers.
One example comes from my personal experience. I have aftermarket JBA headers on the Hemi engine in my everyday car, paired with a Diablo Sport performance tune. The result is a marked increase in horsepower, but the effect on fuel economy is minor and relies heavily on my driving habits. Even with the headers, I still need to use premium fuel to achieve optimal performance. This highlights the fact that while headers can offer some benefits, their impact is often nuanced and depends on a variety of factors.
Comparing Shorty Headers and Stock Manifolds
When considering whether to install shorty headers or stick with the stock manifolds, it is essential to weigh the potential benefits against the drawbacks. In many cases, good long tube headers provide a more substantial improvement in both horsepower and torque due to superior scavenging capabilities. Scavenging, which refers to how effectively the engine can expel exhaust gases and draw in fresh air, is a critical factor in engine performance.
While some manufacturers might claim that shorty headers will improve gas mileage, these claims should be approached with skepticism. In reality, the impact on fuel efficiency is often minimal, and long tube headers are typically more advantageous in terms of both performance and economy.
Conclusion
In summary, shorty headers can potentially increase gas mileage by a small margin, but the extent of this improvement varies depending on numerous factors, including the car model, engine type, and driving habits. Before making any modifications, it is crucial to consider both the potential benefits and drawbacks, as well as legal compliance. While shorty headers can offer some advantages, long tube headers are often a more reliable choice for enhancing both performance and efficiency.