Headers & Exhaust Manifolds: What's The Difference?

Introduction

• Question: What are headers and how do they differ from exhaust manifolds?
• Context: This is a common query among automotive enthusiasts seeking to upgrade car performance.
• Purpose: To explore the headers vs. manifold debate.

What Is An Exhaust Manifold?

• Function: Collects exhaust gases from the engine and channels them down the exhaust pipe.
• Construction: Made from thick cast iron or stainless steel.
• Design: Typically collects gases from multiple cylinders into one tube.
• Usage: Single manifold for in-line engines; dual manifolds for V- or flat-configuration engines.

What Do Headers Do for My Car?

• Nature: An aftermarket upgrade for the exhaust manifold.
• Design: Uses longer, lighter pipes tuned for maximum performance.
• Structure: May have more complex pipework to fit within the engine bay.
• Benefit: Allows smoother gas flow with less turbulence, resulting in faster revving and responsive performance.

Differences Between Exhaust Manifold and Header

• Installation: Manifolds are factory-fitted; headers are aftermarket.
• Cost: Manifolds are cheaper; headers are expensive due to specialized design and materials.
• Performance: Manifolds balance performance and efficiency; headers are made for maximum performance.
• Back Pressure: Headers decrease back pressure; manifolds retain it for drivability and noise reduction.

Verdict: Which Should I Use?

• Consideration: Header installation is more beneficial with a complete exhaust system overhaul.
• Dependency: Effectiveness depends on the specific car and existing exhaust system.

Additional Performance Upgrades

• Engine Intake: Upgrade to a freer-flowing system with a high-flow air filter.
• ECU Reflash: Unlock extra power through tuning, preferably by professionals.
• Fuel System: Upgrade from carburetor to EFI for power and reliability gains.
• Ignition System: Replace old systems with modern digital ignition.
• Carburetor: Consider 4-barrel upgrades for older cars.
• Camshaft: Install mild or fast road cams for more power.
• Turbo/Supercharger: Consider sizable boosts but ensure supporting systems can handle the load.

Conclusion

• JEGS’ Role: Founded by Jeg Coughlin to supply performance parts; now a leading provider in the market.
• Additional Support: JEGS offers a range of parts and expert advice for automotive performance enhancements.