Borla CrateMuffler Big Block Mopar

Universal Fitment

Part #: 400941

Overview

The Borla 400941 CrateMuffler is a high-performance exhaust component designed specifically for big block Mopar engines, including 383, 413, 426, and 440 V8s. Crafted to optimize both sound and power, this muffler is ideal for enthusiasts and builders seeking a distinctive, aggressive exhaust note while maintaining durability and reliable performance. Its purpose-built design enhances the auditory experience of crate and custom-built motors, making it a perfect upgrade for muscle car restorations, custom builds, or performance modifications. Constructed with precision and quality materials, the CrateMuffler helps deliver a balanced combination of sound, flow, and longevity, supporting your vehicle’s performance goals with a robust and reliable exhaust solution.

Key Features

This CrateMuffler features a thoughtfully engineered design aimed at maximizing sound quality and exhaust flow. Made from durable materials, it incorporates Borla’s renowned ATAK® (Acoustically Tuned Applied Kinetics) technology, producing an aggressive yet refined exhaust tone. Its offset/center inlet configuration and oval body shape ensure a perfect fit for big block Mopar engines, providing a straightforward installation process. The muffler’s compact dimensions—14 inches in length, 4.35 inches wide, and 9 inches tall—allow it to fit seamlessly into a variety of custom exhaust setups. The directional design ensures optimal exhaust flow and sound directionality, enhancing your vehicle’s auditory presence without sacrificing performance or reliability.

Construction & Design

The Borla CrateMuffler is constructed with high-quality stainless steel, ensuring resistance to corrosion and heat for long-lasting durability. Its oval shape and offset/center inlet design are engineered for precise fitment and efficient exhaust flow. The internal construction features Borla’s proprietary sound-absorbing and flow-enhancing materials, which contribute to its signature ATAK® sound profile. The muffler’s design emphasizes both aesthetic appeal and functional performance, making it a reliable upgrade for serious enthusiasts.

Driving Feel & Feedback

This muffler helps produce a bold, aggressive exhaust note that enhances the driving experience by providing a more engaging and visceral sound. Its design supports improved exhaust flow, which can contribute to a slight increase in throttle response and engine efficiency. The ATAK® technology ensures a deep, resonant tone that amplifies the character of your big block Mopar engine, making every drive more exhilarating.

Installation & Fitment

Designed for straightforward installation, the CrateMuffler’s dimensions and inlet/outlet configuration are tailored for compatibility with 2.5-inch exhaust systems on big block Mopar engines. Proper fitment should be verified against your vehicle’s specific setup and the part number provided. The muffler is intended to be a direct bolt-on replacement or upgrade, simplifying the upgrade process for experienced mechanics and enthusiasts alike.

What’s Included

The package includes the Borla CrateMuffler with the specified dimensions and inlet/outlet configuration, ready for installation. Hardware or additional mounting components are not included and should be sourced separately if needed.