How to Make L5P Louder Without Deleting?

You can make L5P louder through the following methods.

  • Upgrading the exhaust system
  • Installing a cold air intake
  • Installing a cat-back exhaust system
  • Adding a 5 inches exhaust system
  • Replacing the turbocharger

Now that you know a few common methods to make L5P louder without deleting, let’s get started on the details.

The L5P engine, developed by General Motors, has powered the Chevrolet Silverado HD and GMC Sierra HD trucks since 2017. Recognized for its robust design and enhanced performance, it boasts a 6.6-liter V8 turbodiesel configuration with advanced features like an upgraded fuel delivery system, refined turbocharger setup, and improved cylinder components.

Under the hood, the L5P engine produces a distinct diesel engine sound, a resonant rumble resulting from its combustion process and engineering design. However, the volume of this sound can differ based on factors such as the vehicle’s exhaust system and sound insulation.

For those interested in amplifying the engine’s audible impact, modifications to the exhaust system can be considered. Alterations like installing a less restrictive aftermarket exhaust, such as straight pipes or performance enhancements, can intensify the engine’s sound, creating a more pronounced and assertive note. Additionally, adjusting or removing parts like the muffler or diesel particulate filter (DPF) may also increase the engine’s noise level.

How to Make L5P Louder Without Deleting

How to Make L5P Louder Without Deleting?

For those who are looking for ways to make their Duramax L5P louder without deleting, these are the proven methods. Now, let’s look at each method in detail. 

Upgrading the Exhaust System

If you want to make L5P louder without deleting it, you should upgrade the exhaust system. It involves replacing the exhaust system with a high-performance muffler. 

Make sure, however, that any modifications to the exhaust system are in compliance with local laws and regulations regarding noise emissions. For example, in California, 95 dbA is the legal limit that you have to follow. 

To upgrade the exhaust system, it is better if you are already experienced in DIY work. You need to grab some tools, such as the 18- and 21-mm sockets. Apart from that, there is a requirement for the wrench, extension, and wobble tips. 

For a step-by-step process on upgrading the exhaust system, check this 2016 Duramax: Flo Pro 5″ Exhaust With Muffler Install video. 

Installing a Cold Air Intake

You can make your L5P louder by installing a cold air intake. The density of cold air is higher than that of warm air. So, when you install a cold air intake, you enhance your engine’s ability to breathe in air that is more oxygen-dense.  A louder sound will be produced when the engine breathes in colder, denser air. 

However, you don’t have to replace the exhaust when you install a cold air intake. There are only a few parts you need to install.

Before trying to install the cold air intake, grab a few tools, such as the 10- and 13-mm sockets. Along with that, a T20 Torx Screw. 

Installing the cold air intake can be summed up in the following few important steps. 

  • Intake Removal
  • Intake Box Removal
  • Mass Air Meter Removal
  • Box Plug Installation
  • Inlet tube installation
  • Top Gasket Installation
  • Air Filter Inspection

However, if you are looking for a video guide, then watch this L5P Duramax S&B Cold Air Intake How-to Install

The cold air intake also improves the performance of your engine. The reason for this is that cold air intake enhances the engine’s power and fuel economy. 

Overall, some advantages of cold air intake in the engine are 

  • Increased horsepower and torque
  • Better fuel economy
  • Improved acceleration
  • Better engine performance

Consult a professional if you are uncomfortable doing it yourself. The total cost should be between $150 and $400. Parts cost $100 to $300, and service costs $50 to $100. 

Installing a Cat-Back Exhaust System

You can make the L5P louder without deleting it by installing a cat-back exhaust system.

A cat-back exhaust system replaces the stock exhaust system from the catalytic converter back, providing enhanced flow and a more aggressive sound.  One of the key advantages of a cat-back exhaust system is its potential to increase horsepower and torque by reducing back pressure.

A cat-back exhaust system for your truck should be specifically designed for the make and model of your truck. The L5P can be equipped with cat-back exhaust systems from renowned brands like MagnaFlow, MBRP, and Borla.

Following are the steps for installing a cat-back exhaust system.

Tools Required:

  • Jack and four jack stands
  • Wheel chocks
  • Socket set
  • Exhaust gasket
  • Exhaust hanger removal tool
  • 17mm wrench
  • Torch and Damaged bolt remover set

Step 1: To secure the car, place the wheelchocks. Support the car with jack stands and jack up the car as high as possible.

Step 2: Find the three bolts and nuts holding the stock cat-back system to the exhaust. Remove the bolts by loosening them with the 17mm socket.

Step 3: Check the condition of the new cat-back exhaust. Make sure no bolts are corroded. 

Step 4: Install the secondary catalytic converter with a new gasket and bolt. The bolt should be aligned towards the back of the car.

Step 5: Connect the cat-back exhaust system to the catalytic converter and align the gasket.

Step 6: Use the wrench and socket to tighten the bolts.

Step 7: Attach the rubber hangers to the exhaust system so that it is supported.

Step 8: Check all connections and make sure there are no leaks before lowering the car.

Step 9: Check the sound of the engine after lowering the car and turning it on. If everything goes according to plan, you have successfully installed the cat-back exhaust system. 

If you want to go for a video demonstration, then check this: How to Install a Cat Back Exhaust.

Adding a 5 Inches Exhaust System

L5P can be made louder by adding a 5-inch exhaust system. By increasing the size of the exhaust system, it becomes more free.

Exhaust backpressure is reduced by a freer exhaust system. As a result of backpressure, the engine has to work harder and is less reliable. 

Following are the steps for adding a 5-inch exhaust system to the L5P engine. 

Tools Required: 

  • Socket set
  • Spring [To Adjust clearance for the hitch]
  • Tip [for Tailpipe]
  • Clamps
  • V-band clamp
  • Welding tool

Step 1: Remove the engine’s exhaust system. This How To Install L5P Duramax Manifolds, Up-Pipes, and Down-Pipe! is a video to help you with the process. 

Step 2: Secondly, unbox the 5-inch exhaust system and attach the front pipe to the turbo downpipe. Secure this connection with a new V-band clamp. 

Step 3: Assemble the exhaust section according to the instructions

Step 4: Using the clamps and hangers provided, hang the exhaust system. Align the exhaust properly. 

Step 5: Check the clearance for the exhaust. This prevents any part of the exhaust from rubbing against the truck’s body. When the exhaust system is working, it can get extremely hot functioning. If there is not enough clearing, then the component in touch can get damaged. 

Step 6: Tack and weld the seams and hangers to add security and stability.

Step 7: The final step is to tighten the clamps and connections. Make sure there are no loose fittings. 

Step 8: Install the exhaust properly. 

Step 9: Now start the engine and let it run to check the sound. 

For a visual demonstration, check this 5-inch video. 

Replacing the Turbocharger

Replacing the turbocharger is another way you can make the L5P louder without deleting it. Following are the steps for replacing the turbocharger.

Tools Required:

  • 10 mm socket
  • 13mm socket
  • 11mm deep socket
  • Quarter-inch socket
  • Swivels
  • Swivel box wrench
  • 22mm open-end wrench
  • Ratchet 

Step 1: Start by disconnecting both batteries’ negative terminals. Using a 13mm socket, remove the air intake system and ductwork connected to the turbo mouthpiece.

Step 2: Remove the bracket on top of the AC compressor by removing the wiring harness clips attached to it.

Step 3: Remove the serpentine belt and loosen the belt tensioner with a half-inch ratchet wrench.

Step 4: Take out the AC compressor bolts, taking care not to damage any electrical connections.

Step 5: Disconnect the turbo mouthpiece from the ventilation tube by removing the Y bridge and 13mm bolt.

Step 6: Remove the 13mm bolts that connect the downpipe to the catalytic converter on the passenger side. Remove the four 10mm bolts holding the turbo pedestal in place.

Step 7: Disconnect the coolant pipe using two 10mm bolts on top and a 13mm bolt below.

Step 8: Using 10mm bolts, remove the turbo heat shields. Using an 11mm deep socket, loosen the V-band clamp connecting the catalytic converter to the turbo.

Step 9: Use 13mm sockets to remove the turbo pedestal bolts. Next, remove the turbo’s coolant line and EGT sensor.

Step 10: Unbolt the two 10mm bolts holding the oil drain tube to the turbo and replace the gasket.

Step 11: Install the new oil drain tube gasket after pounding out the rivets.

Step 12:  Use an oil can to squirt oil into the turbo.

Step 13: Reconnect the turbo oiling feed line.

Step 14: Start the truck and let it idle for 10-15 minutes, checking for leaks of oil and coolant.

If you want to learn from the video, then check this:

How to install a Duramax 2017-2021 L5P Turbo | RDS 64mm

Is Making L5P Louder Without Deleting DPF Legal?

No, there has not been a direct law that states the legality of making L5P louder by deleting DPF. Adding stainless steel pipe to the L5P and removing the muffler, however, is illegal. Furthermore, this will void the vehicle’s warranty.


In conclusion, this article has provided valuable insights and strategies on how to make L5P louder without deleting components. You can unleash the true sound power of your L5P engine by following these methods. This guideline will take your ride from quiet to roaring, and you’ll be able to enjoy a whole new level of excitement.

Last Updated on May 24, 2024 by Rifen

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top