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

Key Features & Performance Benefits

• Helps fix the common “Chevy tick”: Replaces warped, cracked, or leaking factory cast manifolds that often cause cold-start ticking.
• Long tube header design: Improves exhaust scavenging compared with stock manifolds or short factory-style replacements.
• Supports 20-25+ HP gains on properly tuned builds: Long tube headers can help unlock noticeable horsepower and torque gains when paired with the right tune, intake, and exhaust setup.
• Works with 4.8L, 5.3L, and 6.0L Vortec V8 engines: A strong match for common GMT800 Silverado, Sierra, and Avalanche 1500 builds.
• Includes matching Y-pipe: Built as a more complete header setup instead of just a pair of loose headers.
• Stainless steel construction: Helps resist heat, pressure, and corrosion better than old factory cast manifolds.
• Better exhaust sound: Gives the truck a deeper, sharper V8 exhaust note, especially when paired with a good cat-back system.

Installation & Demo Video

Watch this short video to see the Flashark long tube headers and Y-pipe installed on a 1999-2006 Silverado 1500:

Long Tube Headers vs Shorty Headers for a 5.3 Silverado

For a 1999-2006 Silverado or Sierra 5.3L, long tube headers are usually the better choice when the goal is stronger performance and a more aggressive exhaust note. Shorty headers are easier to package, but they do not usually deliver the same scavenging advantage as a long tube setup.

What Problems Does This Kit Help Solve?

The factory cast exhaust manifolds on high-mileage GMT800 trucks are known for heat cycling, warping, broken manifold bolts, and gasket leaks. That is where the ticking sound usually comes from. Replacing tired stock manifolds with a stainless long tube setup can clean up the leak, improve flow, and give the truck a more responsive feel.

• Cold-start ticking from manifold leaks
• Broken or rusted factory manifold bolts
• Restrictive stock manifold flow
• Weak exhaust tone from factory exhaust routing
• Performance bottlenecks on tuned, cammed, or intake/exhaust upgraded 5.3L builds

Performance Notes: What Gains Should You Expect?

A long tube header kit is not magic by itself, but it is one of the better bolt-on upgrades for a 4.8L, 5.3L, or 6.0L Vortec truck when the rest of the setup can support it. With a proper tune, intake, and a healthy exhaust system, gains in the 20-25+ HP range are realistic for many builds. Without tuning, the truck can still feel sharper, but you may not unlock the full benefit.

📦 Packing List:

• Long Tube Headers (Pair)
• 3" Y-Pipe
• Gaskets
• Hardware

Shipping, Warranty & Customer Support

• Estimated Delivery: Most orders are delivered within 7-9 business days after shipment, depending on warehouse availability and destination.
• 1-Year Warranty: This product is backed by a 1-year warranty against manufacturing defects.
• Returns & Fitment Support: Please confirm your vehicle year, model, engine, and drivetrain before ordering. If you are unsure about fitment, contact customer support before purchase.
• Customer Support: Our support team can help with basic fitment questions, order issues, and warranty-related support.

Who This Header Kit Is Best For

• 1999-2006 Silverado/Sierra 1500 owners replacing leaking factory manifolds
• 5.3L Vortec owners wanting a deeper, more aggressive exhaust sound
• Cammed or tuned GMT800 trucks that need better exhaust flow
• 4.8L and 6.0L Vortec owners upgrading the exhaust system
• 2WD truck owners who want the easiest fitment path
• DIY builders who understand that 4WD models may require extra Y-pipe work