91-99 Grand Cherokee Wrangler XJ YJ TJ 4.0L Header Stainless Steel
4.0L Stainless Steel Header
Cast stainless steel header engineered for 4.0L inline-six engines, designed to improve exhaust flow and heat resistance. Built from premium stainless construction to resist corrosion and withstand engine bay temperatures. Direct bolt-on fitment eliminates guesswork on installation.
Key Features
- Stainless Steel Construction - Resists rust and corrosion better than mild steel, extends component life in harsh conditions
- Optimized Header Design - Larger diameter tubing reduces backpressure and promotes scavenging for the 4.0L platform
- Bolt-On Installation - Direct fit at factory mounting locations, no welding or custom fabrication required
Specs
- Material: Stainless Steel
- Configuration: Cast construction with optimized tube diameter
- Condition: New
Whats Included
- Header assembly only — fasteners not included
Frequently Asked Questions
Do I need to buy new bolts to install this?
You'll want to grab new header bolts separately — factory bolts often seize or strip. Use stainless or high-temp rated fasteners rated for header applications, and torque to your vehicle's service manual spec.
Can I reuse my old exhaust manifold gasket?
No. Always use a fresh gasket when bolting on a new header. Old gaskets compress and won't seal properly, which leads to leaks and heat loss. Pick up a header gasket kit before installation day.
Will this header work with my stock exhaust system?
Yes, it bolts directly to factory flanges. Your existing downpipe and exhaust will connect without modification. If you're upgrading the rest of the system later, this header is a solid first step.
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.