What material is the aFe Twisted Steel Header made from?

The header is constructed from 14-gauge 409 stainless steel tubing. This material is chosen for its resistance to rust and corrosion.

Does this header require any modifications to install on my Jeep Wrangler YJ?

No, this header is a 100-percent bolt-on part. It is designed to fit directly onto your 1991-1999 Jeep Wrangler YJ 4.0L without any modifications needed.

What is 'pulse control technology' and how does it help?

Pulse control technology, combined with mitered collectors and optimized tube lengths, is designed to manage exhaust gas pulses. This helps improve exhaust flow and velocity for better power delivery across the entire RPM range.

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aFe

Specifications

Brand: aFe
Part #: 48-46201
UPC: 802959480021

aFe

aFe Twisted Steel Header SS-409 HDR Jeep Wrangler YJ 91-99 I6-4.0L

Name: aFe Twisted Steel Header SS-409 HDR Jeep Wrangler YJ 91-99 I6-4.0L
Brand: aFe
SKU: afe-afe-twisted-steel-header-ss-409-hdr-jeep-wrangler-yj-91-99-i6-4-0l-t14-255881
Price: 871.00 USD
Availability: InStock

$871.00

Only 4 left in stock

This aFe Twisted Steel header is made from 14-gauge 409 stainless steel for your Jeep Wrangler YJ 4.0L. It uses pulse control technology for better flow.

Key Features

409 Stainless Steel Tubing — Resists rust and corrosion.
1/2-inch Thick Head Flange — Solid mounting surface for a good seal.
Mitered Collectors and Optimized Tube Lengths — Designed for better exhaust gas flow and velocity.
Pulse Control Technology — Works to improve power delivery across the RPM range.
100-percent Bolt-On Installation — Fits directly onto your Jeep without needing modifications.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

The new Twisted Steel performance header from aFe Power is redefining the header industry with new pulse control technology. aFe engineers have designed this header using optimum tube lengths and mitered collectors for maximum flow and velocity for power delivery across the entire power band. Combine with a large 1/2" thick head flange and 14-gauge 409 stainless steel tubing, you have a header that is strong and powerful. Twisted Steel headers are 100-percent bolt-on with no modifications necessary and are proudly engineered and built in Corona, CA.