Specifications:
- Brand Name: FLASHARK
- Certificate: ISO9001:2000
- Application: Automobile Exhaust Header
- Material: Stainless Steel
- Surface: Mirror Polish
- Model: EH28035
- Outlet Size: 2.5"
- Primary Tube Size: 1.75"
- Head Flange Thickness: 7/16"
- Outlet Flange Thickness: 3/8"
Exhaust Header VS Manifold, which is the better choice?
The structural differences between exhaust headers and manifolds are the material and size. From the material, exhaust headers are made of lighter, thinner steel, while exhaust manifolds are made of thick iron. Exhaust headers are also longer than exhaust manifolds. When in use, exhaust manifolds create back pressure, which lowers performance. Because each cylinder of the engine is given its own tube, however, headers eliminate this problem; thus, allowing the gases to exit without the creation of back pressure. Therefore, exhaust headers are a BETTER choice than an exhaust manifold.
Replacing or upgrading your exhaust header is necessary for both engine performance and sound. Whether on or off the track, exhaust headers provide more horsepower and improved exhaust sound. FLASHARK offers many products to help you create your own custom engine headers. It's really easy and convenient to use: direct bolt-on, no modification needed.
Fitment & Compatibility
| Brand | Model | Year Range | Full Compatible Specs |
|---|---|---|---|
| GMC | Yukon | 2000-2001 | Factory-Equipped 4.8L Vortec V8 / 5.3L Vortec V8 Engine; Fits All Standard Trim Levels |
| GMC | Sierra 1500 | 1999-2001 | Factory-Equipped 4.8L Vortec V8 / 5.3L Vortec V8 Engine; Fits All Standard Trim Levels |
| GMC | Sierra 2500 | 1999-2001 | Factory-Equipped 4.8L Vortec V8 / 5.3L Vortec V8 Engine; Fits All Standard Trim Levels |
Q1: Which GMC models are compatible with this exhaust header kit?
A1: These headers are specifically engineered for the 1999-2001 GMC Sierra 1500 and 2500, as well as the 2000-2001 GMC Yukon and Yukon XL. They are designed to fit the 4.8L and 5.3L V8 engines perfectly, ensuring a high-performance upgrade for your truck or SUV.
Q2: Does this header kit include a port for the EGR system?
A2: Yes, this model is specifically designed "With EGR." It includes the necessary EGR (Exhaust Gas Recirculation) port to maintain compatibility with your vehicle's factory emissions equipment, making it the ideal choice for 1999-2001 models that require this connection.
Q3: What are the primary performance benefits of upgrading my GMC Sierra headers?
A3: By replacing your restrictive factory manifolds with these free-flowing headers, you can expect a significant increase in horsepower and torque. The improved exhaust scavenging enhances engine efficiency, provides better throttle response, and gives your 5.3L or 4.8L engine a much more aggressive V8 roar.
Q4: Will these headers fit the GMC Yukon XL 5.3L models?
A4: Absolutely. This kit is fully compatible with both the standard Yukon and the Yukon XL equipped with the 4.8L or 5.3L V8 engines from the 2000-2001 model years, provided they utilize the EGR system.
Q5: What material is used for the Flashark GMC exhaust headers?
A5: These headers are constructed from high-quality stainless steel to ensure long-lasting durability and resistance to corrosion and heat. The polished finish not only provides a professional look under the hood but also withstands the harsh conditions of high-exhaust temperatures.
Q6: Are these headers a direct bolt-on for the 1999 GMC Sierra 1500?
A6: Yes, they feature a direct bolt-on design. They are engineered to align with the factory exhaust ports of your 1999-2001 GMC Sierra, minimizing the need for complex modifications during the installation process.
Q7: Does the kit come with all necessary installation hardware?
A7: Yes, the Flashark exhaust header kit comes complete with premium gaskets and the required mounting bolts. We provide the essential hardware needed to ensure a tight, leak-free seal between the header and the cylinder head.
Q8: Why should I choose headers with an EGR port for my 2000 Yukon?
A8: If your 2000 GMC Yukon was originally equipped with an EGR system from the factory, choosing a header without the port would trigger a Check Engine Light (CEL) and likely cause you to fail emissions testing. This header ensures your vehicle remains functional and compliant with its original design.
Q9: How do these headers improve fuel efficiency on the 4.8L and 5.3L engines?
A9: By reducing exhaust backpressure, your engine doesn't have to work as hard to expel spent gases. This increased efficiency allows for better fuel combustion, which can lead to a slight improvement in MPG (miles per gallon) under normal driving conditions.
Q10: Will these headers fit the 2002 GMC Sierra or Yukon models?
A10: While many 2002 models share the same engine architecture, some moved away from the EGR system. This specific kit is optimized for 1999-2001 Sierra and 2000-2001 Yukon models that definitely feature the EGR port. Always check your factory manifold for the EGR tube before ordering.
Q11: Can these headers withstand heavy towing with my Sierra 2500?
A11: Yes. The heavy-duty stainless steel construction and thick flanges are designed to handle the increased heat and stress associated with towing and heavy-duty use in the Sierra 2500 series trucks.
Q12: How will the exhaust sound change after installing these headers?
A12: You will notice a deeper, throatier exhaust note. These headers amplify the natural rumble of the GM small-block V8, giving your GMC Sierra or Yukon a much more powerful and commanding presence on the road.