aFe BladeRunner Exhaust Manifold

1998–2002 Dodge Ram 2500 / Ram 3500 5.9L Diesel

Part #: 46-40032

Overview

The aFe BladeRunner Exhaust Manifold is a premium direct replacement designed specifically for the 1998 to 2002 Dodge Ram 2500 and Ram 3500 trucks equipped with the 5.9L inline-six diesel engine. Engineered to outperform the factory manifold, it significantly improves exhaust flow and throttle response, making it an ideal upgrade for owners seeking enhanced engine efficiency and durability without complex modifications.

Built to withstand the rigors of heavy-duty use, this manifold offers a reliable and cost-effective solution for maintaining or boosting your truck’s performance. Whether you use your Ram for daily driving, work, or towing, the BladeRunner manifold delivers improved power delivery and long-term reliability.

Key Features

Designed with advanced engineering and quality materials, the aFe BladeRunner Exhaust Manifold offers the following benefits:

• Outflows the factory manifold by up to 50%, enhancing engine performance and throttle response.
• Constructed from durable cast ductile iron for superior strength and thermal resistance.
• Thick wall flange design prevents warping and cracking under high heat and stress.
• Matched ports and merged runner layout reduce exhaust backpressure for improved efficiency.
• Equipped with dual 1/8" NPT exhaust gas temperature (EGT) ports for easy gauge installation.
• One-piece construction with reinforcing rib between wall flanges for maximum structural integrity.
• Includes all necessary mounting hardware for a straightforward installation.

Construction & Design

The BladeRunner manifold is expertly crafted from cast ductile iron, a material chosen for its exceptional strength and resistance to thermal stress compared to standard cast iron. This ensures the manifold can endure the extreme temperatures and pressures generated by the 5.9L inline-six diesel engine during demanding operation.

Its thick wall flange design enhances structural integrity, preventing common issues such as warping and cracking that occur with prolonged heat exposure. The matched port and merged runner design optimize exhaust gas flow by minimizing turbulence and backpressure, resulting in improved engine breathing and overall efficiency.

A reinforcing rib between the wall flanges adds further rigidity, ensuring long-lasting durability even under heavy-duty conditions.

Performance & Sound

By increasing exhaust flow by up to 50% over the stock manifold, the aFe BladeRunner improves throttle response and overall engine performance. Reduced backpressure allows exhaust gases to exit more efficiently, which can lead to smoother power delivery and potentially better fuel economy under load.

While primarily focused on performance, this manifold also helps produce a cleaner exhaust pulse, subtly enhancing the exhaust note without introducing excessive noise or drone.

Installation & Fitment

The BladeRunner Exhaust Manifold is designed as a direct bolt-on replacement for the factory manifold on 1998–2002 Dodge Ram 2500 and Ram 3500 trucks with the 5.9L inline-six diesel engine. Installation is straightforward and requires no modifications to the engine or exhaust system.

All necessary mounting hardware is included for a hassle-free installation. Please note that gaskets are not included and should be purchased separately to complete the installation.

What's Included

• Cast ductile iron exhaust manifold
• Dual 1/8" NPT EGT ports
• Complete installation hardware

Ideal For

This exhaust manifold is perfect for Dodge Ram 2500 and Ram 3500 owners from model years 1998 through 2002 who want a durable, performance-oriented upgrade. It suits daily drivers, work trucks, and diesel enthusiasts looking to improve throttle response and exhaust flow without extensive engine modifications.

Emissions Note

This product is not CARB exempt and is not legal for sale or use on vehicles registered in California or states that enforce California emissions standards.

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.