Stainless steel header engineered for the TJ 4.0L to improve exhaust scavenging and flow. Built from corrosion-resistant stainless construction, this header replaces the factory cast manifold with a mandrel-bent design. Direct bolt-on fit at factory mounting locations.
Mandrel-bent tubing — Maintains consistent diameter through each bend for unrestricted flow.
Stainless steel material — Resists rust and thermal degradation over time.
Factory bolt-on design — Uses existing engine bay mounting points, no modification needed.
Specs
Material: Stainless Steel
Design: Mandrel-bent primary tubes
Configuration: Direct-fit header assembly
What's Included
Header assembly
Frequently Asked Questions
Will I need new gaskets or fasteners to install this?
Factory head bolts will work, but you should use a quality gasket set rated for your engine. Existing hardware is reusable if in good condition — inspect before assembly.
Does this header need to be painted or ceramic coated?
Stainless steel will develop heat patina over time and won't rust. Ceramic coating is optional — many run these bare for the natural stainless look, or coat them if you prefer a finished appearance.
What's the difference between this and the factory cast manifold?
The factory manifold is cast iron and restrictive. This header's tubing design improves exhaust scavenging and flow, which supports better engine breathing. Temperature management is also more consistent with stainless construction.
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**Rates from 0%-36% APR. Payment options through Shop Pay Installments, are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers https://www.affirm.com/licenses.
