Performance Build Guide: Installing Manley 5.7 Hemi Headers and Achieving 520 Rwhp in a Weekend

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When it comes to enhancing the performance of your 5.7 HEMI, installing a set of high-quality headers is one of the most effective modifications you can make. In this guide, we will walk you through the process of installing Manley 5.7 HEMI headers and achieving a remarkable 520 rear-wheel horsepower (RWHP) in just a weekend.

Understanding the Benefits of Upgrading to Manley Headers

Upgrading to Manley headers can significantly improve your engine’s performance. Here are some of the key benefits:

  • Increased Horsepower: Headers can optimize exhaust flow, leading to more horsepower.
  • Improved Torque: Enhanced exhaust scavenging can result in better torque across the RPM range.
  • Better Sound: Headers provide a more aggressive exhaust note that many enthusiasts appreciate.
  • Weight Reduction: Aftermarket headers can be lighter than factory components, improving overall vehicle dynamics.

Tools and Materials Needed

Before you start the installation, gather the following tools and materials:

  • Manley 5.7 HEMI headers
  • Header gaskets
  • Exhaust bolts and nuts
  • Socket set
  • Torque wrench
  • Ratchet and extensions
  • Cutting tool (if needed for old exhaust)
  • Safety glasses and gloves
  • Jack and jack stands
  • Shop towels

Step-by-Step Installation Process

Step 1: Prepare the Vehicle

Start by parking your vehicle on a level surface and engaging the parking brake. Use a jack to lift the front of the vehicle and secure it with jack stands. This will give you ample space to work underneath.

Step 2: Remove the Old Exhaust Manifold

Begin by disconnecting the battery. Next, remove any components obstructing access to the exhaust manifold, such as heat shields or intake parts. Use your socket set to unbolt the old exhaust manifold from the engine. Carefully remove it from the vehicle.

Step 3: Install the Header Gaskets

Before installing the new headers, place the header gaskets onto the engine block. Ensure they are aligned correctly to prevent leaks.

Step 4: Install the Manley Headers

Carefully position the Manley headers onto the engine block, aligning them with the gaskets. Use the provided exhaust bolts to secure the headers in place. It’s crucial to hand-tighten the bolts first before using a torque wrench to ensure they are tightened to the manufacturer’s specifications.

Step 5: Reconnect Other Components

Once the headers are secured, reconnect any components you removed earlier, such as the intake parts or heat shields. Ensure that all connections are tight and secure.

Step 6: Reconnect the Battery and Start the Engine

Reconnect the battery and start the engine. Allow it to idle for a few minutes while checking for any exhaust leaks around the headers.

Tuning for Maximum Performance

After installing the headers, it’s essential to tune your vehicle to achieve optimal performance. Here are some tuning options:

  • ECU Reflash: Consider reflashing your ECU to take full advantage of the headers’ performance.
  • Performance Chip: Installing a performance chip can help optimize fuel maps and timing.
  • Dyno Tuning: Take your vehicle to a professional for a dyno tune to ensure everything is set for maximum power.

Achieving 520 RWHP

With the installation of Manley headers and proper tuning, achieving 520 RWHP is within reach. Here are some additional modifications to consider:

  • Cold Air Intake: Upgrading to a high-performance cold air intake can improve airflow to the engine.
  • High-Performance Exhaust System: A cat-back exhaust system can further enhance exhaust flow.
  • Upgraded Fuel Injectors: Ensure your fuel injectors can deliver the necessary fuel for increased power.
  • Performance Camshaft: Installing a performance camshaft can help increase horsepower and torque.

Conclusion

Installing Manley 5.7 HEMI headers is a game-changer for performance enthusiasts looking to maximize their vehicle’s potential. With the right tools, a bit of patience, and attention to detail, you can complete this installation in a weekend and enjoy the thrill of 520 RWHP. Remember to follow up with proper tuning to ensure your engine runs smoothly and efficiently.