Header for 1999-2006 GMC 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 Long Tube Headers for 1999-2006 Chevy/GMC Silverado, Sierra, Avalanche 1500 (2WD) 4.8L, 5.3L, 6.0L with Y-Pipe Unlock the full potential of your 1999-2006 Chevy/GMC GMT800 Silverado/Sierra/Avalanche 1500 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. Fitment: 1999-2006 GMC Sierra 1500 (2WD) 4.8L, 5.3L, 6.0L Note: Also fits other classic Chevy and GMC models, See full compatibility here . 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. Note: Earlier 2500s might have fitment issues due to chassis being designed from previous years. 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. 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 Delivery: Free Shipping; Shipping Time: Estimated in 3-5 Working Days 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 FAQ Q1: What vehicles are these long tube headers compatible with? A1: These headers are specifically designed for the 1999-2006 GMC Sierra 1500, Chevy Silverado 1500, and Chevy Avalanche. They provide a precise fit for 2WD GMT800 trucks equipped with the 4.8L, 5.3L, or 6.0L Vortec V8 engines. Q2: I see a lot of searches for "long tube headers 5.3 99-06 4wd". Will these fit my 4WD truck? A2: No, these specific long tube headers are engineered exclusively for 2WD (Two-Wheel Drive) models. The front driveshaft and differential on 4WD trucks will interfere with the downward routing of these long tubes. Please check our store for our 4WD-specific header options. Q3: Are these headers suitable for the 5.3 Vortec and 6.0L LQ9 engines? A3: Absolutely. Whether you are upgrading your 4.8 ls, searching for long tube headers for 5.3 vortec, or building a high-performance 6.0L LQ9, the 1.83" primary tubes are perfectly sized to match these exhaust ports, maximizing exhaust scavenging and overall flow. Q4: Do these 99-06 long tube headers come with a Y-Pipe? A4: Yes! To ensure a seamless exhaust upgrade, this kit includes a high-flow 3" Y-pipe that connects the dual 4-1 manifolds. This eliminates the highly restrictive factory Y-pipe and provides a smooth transition directly to your catback exhaust system. Q5: What performance gains can I expect from this gmc sierra 1500 long tube header upgrade? A5: By completely eliminating exhaust backpressure and improving the engine's volumetric efficiency, our mandrel-bent long tube headers can instantly unlock 10 to 15 horsepower and a significant increase in low-end torque. This translates to better towing power and much sharper throttle response. Q6: How will these headers change the exhaust sound of my Chevy Silverado 1500 4.8l 5.3l 6.0l? A6: If you want your truck to sound aggressive, this is the ultimate upgrade. Replacing the thick cast-iron factory manifolds with our stainless steel long tubes provides a deep, throaty, "NASCAR-like" V8 rumble that completely transforms your Silverado or Sierra's presence on the road. Q7: Will these headers fit if my truck has an upgraded 4L80E transmission? A7: Yes, but it requires a minor modification. The larger bellhousing on the heavy-duty 4L80E transmission is wider than the standard 4L60E. You may need to slightly trim or grind the cast ears on the transmission bellhousing to provide proper clearance for the header tubes. Q8: What material are these 2005 gmc sierra 1500 long tube headers made of? A8: Flashark headers are manufactured using high-quality stainless steel with a mirror-polished finish. They feature beautifully TIG-welded CNC machined flanges that prevent warping and eliminate exhaust leaks under extreme engine temperatures. Q9: Is the installation a direct bolt-on process? A9: For 1999-2006 2WD 1500 models, this is designed as a direct bolt-on upgrade requiring no welding. The kit includes all necessary gaskets and hardware. However, due to tight engine bay clearances and the likelihood of rusted factory bolts on older trucks, professional installation by an experienced exhaust shop is highly recommended. Q10: Will these long tube headers fit a 2006 GMC Sierra 2500HD? A10: Unfortunately, no. These are designed strictly for the 1500 (half-ton) chassis. Earlier and current 2500 models have different heavy-duty frame designs and suspension clearances that will prevent these headers from fitting properly. Q11: Do I need to tune my ECU after installing these 5.3 long tube headers? A11: While your truck will run on the factory ECU map, we highly recommend getting a custom tune after installing long tube headers and a high-flow Y-pipe. A proper tune will optimize your air/fuel ratio, prevent Check Engine Lights (CEL) related to downstream O2 sensors, and safely maximize your horsepower gains. Q12: Can I bundle these headers with a Cold Air Intake for better performance? A12: Yes! To maximize your engine's breathing capability, we offer this exact header kit paired with an optional 4-inch Cold Air Intake upgrade directly on this product page. Combining these two upgrades is the most cost-effective way to drastically improve your GMT800's performance.