Borla CrateMuffler

Universal Fitment

Part #: 400840

Overview

The Borla 400840 CrateMuffler is a high-performance exhaust component designed specifically for crate and custom-built engines, including SBC Hot 350 and 383 models. Crafted from durable T-304 stainless steel, this oval muffler combines advanced sound engineering with reliable construction to enhance your vehicle’s exhaust note and overall performance. Ideal for enthusiasts seeking a deep, aggressive sound without sacrificing durability, the CrateMuffler helps optimize airflow and exhaust flow, supporting improved response and a refined driving experience. Its directional design ensures precise exhaust routing, contributing to better heat management and consistent sound quality. Whether you're building a hot rod, restoring a classic, or upgrading your performance vehicle, this muffler offers a tailored solution that balances style, sound, and longevity.

Key Features

This CrateMuffler features a thoughtfully engineered design focused on performance and sound quality. Made from high-grade T-304 stainless steel, it offers excellent corrosion resistance and durability. The oval case measures 14 inches in length, 4.35 inches in width, and 9 inches in height, providing a compact yet effective footprint. Its offset/center inlet configuration allows for flexible installation options, while the 3-inch diameter ensures optimal exhaust flow. The directional outlet, identifiable by the welded mounting bracket on the endcap, helps direct exhaust gases efficiently, contributing to a balanced sound profile and improved engine response. Designed with a focus on sound quality, the S-Type sound signature delivers a deep, aggressive tone that enhances your vehicle’s character. The muffler’s construction supports easy installation and long-term reliability, making it a practical upgrade for performance-minded builders.

Construction & Design

The Borla CrateMuffler is constructed from T-304 stainless steel, known for its corrosion resistance and strength. Its oval shape and directional design are engineered to optimize exhaust flow and sound characteristics, ensuring durability and consistent performance over time. The welded mounting bracket on the endcap provides a secure attachment point, simplifying installation and ensuring proper alignment within your exhaust system.

Driving Feel & Feedback

This muffler is designed to produce a distinctive, deep exhaust tone that enhances the driving experience without overwhelming noise levels. Its optimized airflow and sound engineering support a responsive throttle feel and a satisfying exhaust note, giving your vehicle a more aggressive and refined character. The durable construction ensures consistent sound quality and performance, even after extended use.

Installation & Fitment

The CrateMuffler features a 3-inch inlet and an offset/center outlet configuration, making it compatible with a variety of exhaust setups for SBC Hot 350/383 engines. Its straightforward design allows for relatively simple installation, but verification of fitment against your specific vehicle and exhaust system is recommended to ensure proper alignment and performance.

What’s Included

The package includes the Borla CrateMuffler with welded mounting bracket and all necessary hardware for secure installation. Additional components or hardware are not included and should be sourced based on your specific application requirements.