aFe Twisted Steel Headers

2007–2011 Jeep Wrangler JK 3.8L

Part #: 48-48023

Overview

The aFe Twisted Steel Headers are a premium exhaust upgrade designed specifically for the 2007 to 2011 Jeep Wrangler JK equipped with the 3.8L V6 engine. These headers replace the restrictive factory exhaust manifolds to unlock additional horsepower and torque, enhancing your Jeep’s overall performance and throttle response. Ideal for enthusiasts seeking a direct bolt-on solution, the Twisted Steel Headers improve exhaust flow without requiring extensive modifications or cutting.

Engineered to deliver reliable gains and durability, these headers are perfect for Jeep owners who want to maximize their vehicle’s power output while maintaining factory mounting points and catalytic converters.

Key Features

These headers incorporate advanced design elements and quality materials to ensure superior performance and longevity:

• +6 horsepower and +6 lb-ft torque increase over stock manifolds
• Constructed from 1-1/2" 14-gauge 409 stainless steel tubing for strength and corrosion resistance
• 3/8" thick heavy-duty flanges to prevent warpage and ensure a leak-free seal
• True mitered collectors for improved pulse control and reduced turbulence
• Smooth, increased diameter tubing to minimize exhaust restriction and promote efficient gas flow
• Direct bolt-on installation retaining factory catalytic converters—no cutting or drilling required
• Designed to maintain factory mounting locations for hassle-free fitment

Construction & Design

The aFe Twisted Steel Headers are expertly crafted from durable 409 stainless steel, chosen for its excellent heat resistance and long-lasting corrosion protection. The 14-gauge tubing balances strength with weight, while the 1-1/2" diameter optimizes exhaust flow dynamics. The headers feature 3/8" thick flanges that resist warping under high temperatures, ensuring a consistent, leak-free seal throughout the life of the vehicle.

Unlike formed collectors that can create dead space and turbulence, these headers utilize true mitered collectors. This precision welding technique enhances pulse control technology, allowing exhaust gases to flow smoothly and efficiently, which translates into improved engine breathing and performance gains.

Performance & Sound

By replacing the restrictive factory manifolds with these Twisted Steel Headers, your Jeep Wrangler JK’s 3.8L engine breathes easier, resulting in a noticeable increase in horsepower and torque. The improved exhaust velocity and reduced turbulence contribute to sharper throttle response and enhanced mid-range power. While primarily focused on performance, these headers also produce a more aggressive exhaust note that complements the rugged character of the Wrangler without excessive drone.

Installation & Fitment

Installation is straightforward thanks to the direct bolt-on design that retains all factory mounting points and catalytic converters. No cutting, welding, or drilling is necessary, making it a hassle-free upgrade for DIY enthusiasts or professional installers. aFe recommends purchasing spark plug wire boot protectors (P/N: 48-90001) and gaskets (P/N: 48-90004) to protect spark plug wires from heat and ensure a leak-free seal during installation.

What's Included

• aFe Twisted Steel Headers for Jeep Wrangler JK 3.8L (2007–2011)
• 3/8" thick flanges pre-installed
• Installation instructions

Ideal For

These headers are ideal for Jeep Wrangler JK owners looking to increase engine performance without sacrificing reliability or requiring complex modifications. Perfect for off-road enthusiasts, daily drivers, and anyone seeking improved throttle response and exhaust flow from their 3.8L V6 engine.

Emissions Note

This product is not currently CARB exempt and is not legal for sale or use in California or on vehicles registered with the California Department of Motor Vehicles.

aFe POWER (Advanced FLOW Engineering) offers dyno-proven intake, filtration, and exhaust upgrades aimed at measurable performance gains. The brand’s lineup is geared toward enthusiasts looking for better airflow, improved sound, and durable materials—from cold air intakes to stainless exhaust systems for street and track applications.