Don’t Miss These GM 6.6 Gas Performance Upgrades Options!

How can I upgrade the performance of my GM 6.6 gas engine? A tuner can be the answer to your question! However, there are other options for your GM 6.6 gas performance upgrades.

GM 6.6L L8T V-8 gas engine is the new powerhouse of Chevrolet Silverado HD and GMC Sierra HD. This powerful gas engine provides more horsepower and torque to heavy-duty Chevy trucks than their previous versions.

Apart from the power visible to our eyes, the GM 6.6 gas engine holds more potential that can be uncovered with the performance upgrades available in the market.

Have a look at the common performance upgrades to boost your gas engine.

GM 6.6 Gas Performance Upgrades

Before we go on to discuss the GM 6.6 gas engine performance upgrades, let’s have a look at the GM 6.6L L8T V-8 specifications.

The strong and durable engine was introduced back in 2019 and used in the 2020 model heavy-duty trucks of Chevy and GMC. The cast-iron engine block, aluminum alloy cylinder head, and cast stainless steel exhaust manifold are the factors that make the engine ready to run for a longer period.

GM 6.6 is an 8-cylinder gasoline engine with 8.0 quarts of engine oil capacity. With the insane 401 horsepower and 464 lb-feet of torque, it becomes an ideal and appealing power beast to heavy-duty truck users for its power and towing capacity.

Anyhow, this is certainly not the limit for the 6.6 gas engine. The following upgrades can level up your engine’s performance and give you and wonderful, power-packed experience.

Cold Air Intake (CAI)

Cold air intake, or CAI, is one of the easiest ways to give your engine’s horsepower a push.

A cold air intake system allows more airflow into the engine. Thus, there’s more oxygen supply to the engine. The enhanced oxygen supply provides more power to the engine and gives you a 5 to 20 hp gain!

Although the improvement doesn’t look very convincing, the cold air intake can do wonders when put together with other 2022 GM 6.6 gas performance upgrades. It improves the overall performance by enhancing the vehicle’s horsepower, torque, and acceleration.

Depending on the engine model, the cold air intake can cost $300-$500.

Cat-back Exhaust

Cat-back exhaust is the pipe in the back of the exhaust system that connects the catalytic converter, the muffler, and the tailpipe.

The cat-back exhaust also works to boost the airflow into the engine. With the cat-back exhaust present, the engine has much less work. This means that the engine deals with less work pressure and makes it more fuel efficient.

Along with the fuel efficiency, the cat-back exhaust significantly boosts the mileage and sound. The horsepower also increases from 2%-5%!

The cost of the cat-back exhaust varies depending on its quality and the vehicle model. You may need to pay something between $300 and $3000.

You can also check how a cat back exhaust takes place as one of the efficient Dodge Charger 3.5 performance upgrades and adds an extra 5 to 15 horsepower.


Another simple yet effective way to improve engine performance is the headers.

The job of the headers is to lead the exhaust gases out from the engine to the exhaust system. The headers help decrease the exhaust backpressure to a noticeable amount and give the engine a chance to produce more horsepower.

Headers can give you an extra 10-20 horsepower with increased torque and fuel mileage.

The price of small tube headers and long tube headers is different. However, they should fall in the range of $500-$2000.

GM 6.6 Gas Tuner

Using a tuner in your GM 6.6 gas engine vehicle can improve the overall performance of your truck. A tuner changes the programming of your vehicle according to your needs to bring out the engine’s maximum potential.

The factory default programming often restrains the true potential power of your gas truck. GM 6.6 gas Tuner can show improvement in horsepower, torque, fuel economy, and mileage.

A tuner is capable of increasing the horsepower to as much as 20%. Depending on its features and quality, the price range can be $400-$3000.

GM 6.6 Gas Turbo Kit

The turbo kit increases the air intake density of the engine by forcing the air inside it. The compressed air escalates the power and energy production.

Although a much more complicated process, a turbo kit can add almost 70-150 horsepower. Not to forget the overall performance boost a turbo kit can give to your engine.

Along with improved torque, you’ll notice better fuel efficiency and mileage.

Good quality turbo kit costs around $1500-$10000.

Frequently Asked Questions (FAQs)

Is the Chevy 6.6 gas a good engine?

Chevy 6.6 gas is a powerful engine with an intense payload and towing capacity. The cast iron block engine has a direct injection system. It has 401 hp and 464 lb-feet of torque.

What is the fuel mileage for a 6.6 gas engine?

The fuel mileage for a 6.6 gas engine on the highway is 14 MPG. GM 6.6 gas performance upgrades can increase the mileage.

Does the GM 6.6 Require premium fuel?

No. GM 6.6 does not require premium fuel. The engine needs 87-octane unleaded gasoline.

How much horsepower does a 6.6 gas have?

GM 6.6 L8T gas engine has 401 horsepower and 464 lb-feet of torque. The intense power makes it ideal for towing and payload work.

What transmission does the 6.6 gas have?

GM 6.6 gas engine is used in the 2020 Chevy Silverado 2500HD. The GM 6.6 gas engine in this vehicle has a 6-speed automatic transmission.

Final Thoughts

All of the mentioned upgrades give an overall boost to the engine’s performance. Even though all of them are useful, some of them are most effective than others.

The cold air intake is an easy and cheap way to get a performance upgrade. However, it may not be able to show a beneficial effect when used alone. It serves best with other performance upgrades.

As for the cat-back exhaust and headers can improve the overall performance, such as the horsepower, mileage, and engine fuel efficiency.

 The tuner is quite a good choice for GM 6.6 gas performance upgrades if you consider the hp and overall performance gain.

The turbo kit is the best upgrade you can give your vehicle. This might be the most expensive option on the list, but it is also the most reliable, durable, and worthy one.

To get the top-level performance out of your GM 6.6 gas engine vehicle, opting for these upgrades will be a great idea that can give you the maximum outcome.

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Stephen Sahriyar

There is no twist if you drive your favorite on-road or off-road beast without feeling the performance tune-up.And Stephen is here, the founder of this site,helping you all by finding the answers to your questions regarding your vehicle. He does not get his peace if he fails to research something in a day. Each day is a new challenge for him; that is where he gets the entire sparking gist to make your journey bump-free.

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