Header for 1999-2006 Chevy Silverado 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake Flashark

Exhaust Header for 1999-2006 Chevy/GMC GMT800 Silverado/Sierra 1500 Flashark

Exhaust Header for 1999-2006 Chevy/GMC GMT800 Silverado/Sierra 1500 Y-Pipe 2WD/4WD 4.8L 5.3L 6.0L Flashark

Exhaust Header for 1999-2006 Chevy/GMC GMT800 Silverado/Sierra/Avalanche 1500 Y-Pipe 2WD 4.8L 5.3L 6.0L Flashark

Exhaust Header for 1999-2006 Chevy/GMC GMT800 Silverado/Sierra 1500 Y-Pipe Flashark

Header for 1999-2006 Chevrolet Silverado 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake

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Header for 1999-2006 Chevrolet Silverado 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake

Q: Will these Flashark long tube headers fit my 1999-2006 Chevy Silverado 1500 4WD?

These specific headers are designed primarily for 2WD (Two-Wheel Drive) models. For 4WD Silverado/Sierra 1500 trucks, the front driveshaft and transfer case usually cause clearance issues with long tube designs. We recommend professional verification if you attempt to install them on a 4WD vehicle, as modifications may be required.

Q: Are these headers compatible with all 1999-2006 GM 1500 V8 engines?

Yes, these headers are precision-engineered for the 4.8L, 5.3L, and 6.0L V8 engines found in the 1999-2006 Chevrolet Silverado 1500 and GMC Sierra 1500. This includes popular engine codes like the LM7, LR4, and LQ4/LQ9.

Q: Is a computer tune required after installing Flashark long tube headers?

While your truck will run without a tune, we highly recommend a custom tune (like HP Tuners or a handheld tuner) to maximize performance gains, optimize air/fuel ratios, and clear any potential Check Engine Lights (CEL) caused by the relocation of O2 sensors.

Q: What material are these Silverado exhaust headers made of?

Flashark headers are constructed from high-quality Stainless Steel (T-201/T-304/T-409 options) with a mirror-polished finish. They feature TIG-welded CNC machined flanges to prevent warping and ensure a leak-free seal under high-heat conditions.

Q: Is this a direct "Bolt-on" installation, or is welding required?

These headers are designed as a direct bolt-on kit. However, due to production variances in 1999-2006 trucks, slight modifications (such as minor clearancing or exhaust pipe adjustments) may occasionally be needed. Professional installation is highly recommended to ensure perfect fitment.

SKU: FLES08356

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$269.99Limited Time Deal $399.99

Options: Silver

Style: Header Only

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

Flashark Header for 1999-2006 Chevy Silverado 1500 4.8L/5.3L/6.0L with Optional Cold Air Intake

Unlock the full potential of your 1999-2006 Chevrolet Silverado 1500 (2WD) 4.8L, 5.3L, 6.0L with FLASHARK Long Tube Headers 5.3 99-06. Specifically designed for 4.8L, 5.3L, and 6.0L engines, these headers optimize exhaust flow, improving horsepower and torque for superior engine performance. The high-quality stainless steel construction and precise TIG welded CNC machined flanges ensure durability and a perfect fit for 2WD models, while the included Y-pipe ensures efficient exhaust routing.

These headers are engineered for maximum flow and performance, making them the ideal choice for drivers looking to enhance their truck's sound, power, and overall driving experience. Whether you're upgrading your engine or seeking better exhaust flow, FLASHARK Long Tube Headers provide the performance boost you need for your 1999-2006 Chevy/GMC vehicle.

Specifications:

Brand Name: Flashark
Certificate: ISO9001:2000
Placement on Vehicle: Front
Color: Black, Silver
Surface: Mirror Polish
Header Inlet/Outlet Size (IN):1.83" / 2.84"
2 x 4-1 manifolds connecting into a 3" Y-pipe
TIG welded CNC machined flange
Bolt-on installation
Professional Installation is Highly Recommended
Model: EH28917(ES08207) EH28903(ES08356)
Application: Automobile Exhaust Header

If you like 1999-2006 4.8L, 5.3L, 6.0L Long Tube Headers, please feel free to buy it; after purchasing, you can always contact us for a full refund if you don't want it;

Purchase instructions: professional installation is highly recommended, and while most of the time these exhaust systems work perfectly together, occasionally a slight modification to the exhaust system is required to achieve the perfect fit.

Long Tube Headers 4.8/5.3/6.0L for 99-06 Silverado/Sierra 1500

Features:

1.100% Brand new, never been used.
2. Made of high quality T-201 or T-304 or T-409 stainless steel.( According you requirements)
3. TIG welded CNC machine flan
4. Increase high flow air, instantly gain 10 to 15 Hp. / Tq.
5. Improve Sound, Horsepower & Torque
6. Mandrel-Bent For Maximum Performance
7. TIG Weld & Polished Stainless Steelge.
8. Polished finish surface.
9. Direct bolt-on, no modification needed.
10. High-quality aftermarket parts.
11. Professional workmanship.
12. Strict quality control during the process.
13. The item is the same as the picture shown.
14. All necessary hardware, bolts, and gaskets

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.

Packing List:

1 x set of header exhaust with Y-pipe
Just as the pictures shown

NOTE:

(1)It would be highly appreciated if you might contact us first once you have any problems concerning the items. And you can expect all the issues would be resolved ASAP!
(2)Please let us know before you send us the neutral/negative feedback that wont help to finish the issues. And I will try my best to provide the best solutions which would meet our satisfactory!

🎥Installation Video

Fitment & Compatibility

⚠️ CRITICAL FITMENT RULE (MUST READ BEFORE PURCHASE)

**4L80E transmission installations may require minor bellhousing ear trimming for clearance

✅ Verified Fitment

Brand	Model	Year Range	Full Compatible Specs
Chevrolet	Silverado 1500	1999-2006	2WD / 4.8L / 5.3L / 6.0L Vortec V8 Engine

FAQ: 1999-2006 Chevy Silverado 1500 (4.8L/5.3L/6.0L) Long Tube Headers

Q1: Will these Flashark long tube headers fit my 1999-2006 Chevy Silverado 1500 4WD?

A1: These specific headers are designed primarily for 2WD (Two-Wheel Drive) models. For 4WD Silverado/Sierra 1500 trucks, the front driveshaft and transfer case usually cause clearance issues with long tube designs. We recommend professional verification if you attempt to install them on a 4WD vehicle, as modifications may be required.

Q2: What performance gains can I expect from installing these 5.3L Silverado headers?

A2: By upgrading to Flashark long tube headers, you can typically see an instant gain of 10 to 15 Horsepower and Torque. The mandrel-bent tubing and 4-1 collector design significantly reduce exhaust backpressure compared to stock manifolds, allowing your LS engine to breathe much more efficiently.

Q3: Are these headers compatible with all 1999-2006 GM 1500 V8 engines?

A3: Yes, these headers are precision-engineered for the 4.8L, 5.3L, and 6.0L V8 engines found in the 1999-2006 Chevrolet Silverado 1500 and GMC Sierra 1500. This includes popular engine codes like the LM7, LR4, and LQ4/LQ9.

Q4: Do these long tube headers create a "NASCAR-like" exhaust sound?

A4: Absolutely. Combined with the included Y-pipe, these long tube headers deliver a much deeper, more aggressive muscle car tone. When paired with a cammed setup or performance muffler, it produces that high-performance "NASCAR" growl many Silverado enthusiasts crave.

Q5: Is a computer tune required after installing Flashark long tube headers?

A5: While your truck will run without a tune, we highly recommend a custom tune (like HP Tuners or a handheld tuner) to maximize performance gains, optimize air/fuel ratios, and clear any potential Check Engine Lights (CEL) caused by the relocation of O2 sensors.

Q6: What material are these Silverado exhaust headers made of?

A6: Flashark headers are constructed from high-quality Stainless Steel (T-201/T-304/T-409 options) with a mirror-polished finish. They feature TIG-welded CNC machined flanges to prevent warping and ensure a leak-free seal under high-heat conditions.

Q7: Is the Y-pipe included in the package?

A7: Yes, this kit is a complete exhaust solution that includes both the long tube manifolds and the matching 3-inch Y-pipe, along with necessary gaskets and bolts for a comprehensive installation.

Q8: Is this a direct "Bolt-on" installation, or is welding required?

A8: These headers are designed as a direct bolt-on kit. However, due to production variances in 1999-2006 trucks, slight modifications (such as minor clearancing or exhaust pipe adjustments) may occasionally be needed. Professional installation is highly recommended to ensure perfect fitment.

Q9: Will these headers clear my spark plug wires and steering shaft?

A9: Flashark headers are engineered with specific bends to provide clearance for the steering shaft and factory spark plug locations. However, as with all long tube headers, we recommend using heat sleeves for your spark plug wires to protect them from the increased surface heat of the headers.

Q10: Do I need to relocate my O2 sensors?

A10: Since long tube headers move the collector further back than stock manifolds, you will likely need O2 sensor extensions (sold separately) to reach the new sensor bungs on the headers and Y-pipe.

Q11: Why choose long tube headers over shorty headers for my Silverado?

A11: Long tube headers provide significantly better exhaust scavenging and high-RPM power compared to shorty headers. If you are looking for maximum horsepower gains and the most aggressive sound, long tubes are the superior choice for the 5.3L/6.0L LS platform.

Q12: Can I return the product if it doesn't fit my project?

A12: Yes! We offer a customer-friendly policy. If you find the headers are not suitable for your specific build after purchase, you can contact us for a full refund. We stand behind the quality and performance of our Flashark racing parts.

Q13: What is included in the packing list?

A13: The package comes with 1 x Set of Header Exhaust Manifolds, 1 x Y-pipe, and all essential hardware, including bolts and gaskets as shown in the product images.