Long Tube Headers for 1999-2006 Chevy/GMC Silverado/Avalanche/Sierra 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake

Sharing from ErikRose: LONGTUBE HEADERS ON THE CAMMED SILVERADO 5.3L SOUNDS LIKE A NASCAR

🎥Installation Video

Flashark Long Tube Headers for 1999-2006 Chevy/GMC Silverado/Avalanche/Sierra 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake

FLASHARK Long Tube Headers are designed specifically for 1999-2006 Chevy/GMC 1500 models with 4.8L, 5.3L, and 6.0L engines. These headers improve exhaust flow, delivering a 10-15 horsepower and torque boost, optimizing acceleration and overall engine performance. Crafted from high-quality stainless steel with TIG-welded CNC-machined flanges, they offer durability and a perfect fit. The 3" Y-pipe ensures improved exhaust efficiency, delivering a more aggressive sound.

Vehicle Fitment:

Brand	Model	Year Range	Drive Type	Engine Size
Chevrolet	Silverado 1500	1999-2006	2WD	4.8L, 5.3L, 6.0L
GMC	Sierra 1500	1999-2006	2WD	4.8L, 5.3L, 6.0L
Chevrolet	Avalanche 1500	2002-2006	2WD	4.8L, 5.3L, 6.0L

*Perfectly designed long tube headers to enhance your truck's performance, with optimized fitment for 4.8L, 5.3L, 6.0L engines in 1999-2006 models.

 

Note: 

• If using a larger 4L80E transmission the bellhousing ears may need to be trimmed for proper clearance.
• Purchase Instructions: Professional installation is highly recommended. While these exhaust systems fit perfectly in most cases, minor modifications may occasionally be required for an optimal fit.

Features:

Made of premium T-201, T-304 or T-409 stainless steel and finished with a polished surface, this exhaust system adopts TIG welding, CNC machining and mandrel bent technology for a solid build, smooth airflow and optimal performance, along with TIG-welded polished stainless edges for refined details. It boosts high-flow air intake to instantly increase 10-15HP and torque, enhances exhaust sound and upgrades overall horsepower and torque for a better driving experience. It supports direct bolt-on installation without modification for easy setup, and is equipped with high-quality aftermarket accessories for great after-sales guarantee.

These long tube headers are engineered for durability and performance, ensuring your 1999-2006 4.8L, 5.3L, and 6.0L engines operate at their peak. With our headers, you can expect a noticeable improvement in exhaust flow, enhanced engine sound, and increased horsepower. 

 

Specifications:

Item	Specs
Color	Black / Silver
Finish	Mirror Polished
Inlet/Outlet	1.83" / 2.84"
Connection	2×4-1 Manifold to 3" Y-pipe
Craft	TIG Weld, CNC Flange
Install	Bolt-on

 

Packing List:

1 Set Long Tube Exhaust Header with Y-pipe

 

Maximize Performance & Sound: Chevy 4.8L/5.3L/6.0L Headers

Unlock Extra Power: Flashark Long Tube Headers boost exhaust flow, adding 10-15 HP and torque for faster acceleration, stronger mid-range performance, and better towing or hauling capabilities.

Aggressive Exhaust Tone: These headers deliver a deeper, richer sound tailored for 4.8L, 5.3L, and 6.0L engines. Expect a sporty growl at higher RPMs, giving your truck a commanding presence without being too loud.

Efficient Engine Operation: By reducing exhaust restrictions, these headers improve throttle response and overall engine efficiency, ensuring smoother acceleration and optimized performance with every drive.

Headers vs Stock Exhaust Manifolds For Chevy 4.8L/5.3L/6.0L

When upgrading your 1999–2006 Silverado, Sierra, or Avalanche with 4.8L, 5.3L, or 6.0L engines, it’s important to know how Flashark Long Tube Headers outperform the stock (OEM) exhaust manifolds:

• Exhaust Flow: OEM manifolds are compact and designed for quiet operation, which can restrict exhaust flow. Flashark long tube headers open up the exhaust path, reducing bottlenecks and improving engine efficiency.
• Performance Gains: Stock manifolds provide baseline power, while Flashark headers typically add 10–15 HP and torque by allowing the engine to breathe better.
• Sound Characteristics: OEM manifolds keep your truck quiet, but Flashark headers deliver a deeper, more aggressive tone that enhances the driving experience.
• Durability and Material: Stock manifolds are usually cast iron and prone to cracking under high stress or heat. Flashark headers are made from high-quality stainless steel (T201, T304, or T409), offering superior corrosion resistance, longevity, and a polished finish.

Why Choose Flashark Exhaust Headers?

Choose Flashark exhaust headers for top-tier performance, durability, and easy installation. Crafted from premium stainless steel, our headers improve exhaust flow and deliver noticeable power gains for your Chevy 4.8L/5.3L/6.0L truck.

• Increase Horsepower: Gain 10-15 HP and torque for better acceleration and towing power.
• Built to Last: Made with TIG welding and CNC machining for superior durability.
• Easy Installation: Direct bolt-on fit, no modifications needed.
• Aggressive Sound: Enjoy a deeper, sportier exhaust note.
• Reliable Support: Backed by top-notch after-sales service and warranty.

Upgrade to Flashark today and boost your truck's performance!

About the Chevy 5.3L V8 Engine

The Chevy 5.3L V8 is a popular engine found in trucks like the Silverado and Sierra. Known for its low-end torque and solid performance, it’s a great all-rounder. However, the stock exhaust manifolds restrict airflow, limiting the engine’s full potential.

Upgrading to long tube headers improves exhaust flow, boosting horsepower, throttle response, and giving your truck a more aggressive sound. Flashark Long Tube Headers are designed to enhance the performance of your 5.3L V8, providing noticeable gains in power and efficiency.

FAQ

Q1: Will these headers fit my 1999–2006 Silverado/Sierra 1500?

A1: Yes — these long tube headers fit 1999–2006 Chevy/GMC Silverado and Sierra 1500 2WD models with 4.8L, 5.3L, and 6.0L engines.
Note: Some early 2500 models may have clearance issues due to older chassis design.

Q2: Do these headers work with 5.3L 4WD models?

A2: Flashark Long Tube Headers are designed for 2WD models, but some customers have successfully installed them on 5.3L 4WD models with minor modifications. Depending on your setup, slight adjustments may be needed to ensure a perfect fit.

Professional installation is strongly recommended to ensure proper fitment and performance.

Q3: Do these long tube headers improve 5.3L performance?

A3: Yes, installing Flashark Long Tube Headers on your 5.3L engine can provide noticeable performance gains, adding 10-15 HP and torque. You’ll see improved acceleration, better mid-range power, and enhanced towing capabilities.

Q4: Will these work with 5.3L Silverado headers?

A4: Flashark headers are a great fit for 5.3L Silverado models. By upgrading to long tube headers, you’ll significantly improve exhaust flow, boosting horsepower and enhancing engine efficiency. You’ll also enjoy a deeper, sportier exhaust sound.

Q5: Will these headers fit my 2005 Silverado 5.3L?

A5: Yes, Flashark Long Tube Headers are designed to fit the 2005 Silverado 5.3L. They offer a perfect fit with a direct bolt-on installation, improving horsepower, throttle response, and sound. Minor adjustments may be needed in some cases depending on aftermarket parts.

Q6: Do I need a tune after installing these long tube headers?

A6: A tune is not required for basic fitment, but:

• A tune is recommended to maximize horsepower gains.
• A tune may be required to avoid check engine lights depending on your O2 sensor configuration and local emissions requirements.

Q7: Will these work with a 4L80E transmission?

A7: Yes, but when using a larger 4L80E transmission, the bellhousing ears may need to be trimmed for proper clearance.

Q8: Will these headers cause clearance issues?

A8: Only in two situations:

• Early 2500 models.
• 4L80E transmission without trimming.

Otherwise, normal 1500 2WD models do not have clearance issues.

Q9: Do these headers require cutting or welding?

A9: In most cases, these headers and Y-pipe bolt on directly. However, depending on your existing exhaust setup, a slight modification to the exhaust system may be required for the perfect fit.

Q10: Do these headers improve horsepower?

A10: Yes. Customers typically gain 10–15 HP and torque thanks to improved exhaust flow.