Description
The Borla CrateMuffler Part #400840 is engineered to optimize the sound and performance of small block Chevrolet high output engines, including 350, 383, and 406 V8s. Crafted from premium T-304 stainless steel, this muffler offers superior durability and corrosion resistance compared to T-400 series materials, ensuring long-lasting performance under demanding conditions. Its precision CNC manufacturing guarantees an accurate fit, making installation straightforward and reliable. Designed specifically for crate and custom-built motors, the CrateMuffler features a directional outlet with a mounting bracket welded to the endcap, allowing for customizable sound tuning and reduced drone for a refined driving experience. When installed on compatible applications, it effectively minimizes or eliminates drone noise, enhancing overall engine sound quality. For a deeper, touring-style sound, users can add the optional resonator Part #400939, tailoring the exhaust tone to preference. This muffler is a part of Borla’s commitment to quality, backed by a Million-Mile Warranty, reflecting the brand’s reputation as the most experienced and successful exhaust manufacturer in the industry. Its 3-inch offset/center oval design measures approximately 14 inches in length, 4.35 inches in width, and 9 inches in height, making it suitable for a range of performance builds. With its innovative design and durable construction, the Borla CrateMuffler provides a perfect balance of sound, performance, and longevity, making it an excellent choice for enthusiasts seeking enhanced exhaust tone and reliable performance for their small block Chevrolet engines.
Features:
- Designed specifically for small block Chevrolet high output engines including 350, 383, and 406 V8s
- Made from durable T-304 stainless steel for superior corrosion resistance and longevity
- Directional flow with a welded mounting bracket on the outlet endcap for customizable installation
- Reduces or eliminates drone noise when installed on compatible applications
- Can be paired with optional resonator Part #400939 to achieve a touring sound level
- Precisely CNC manufactured for an accurate fit and optimal performance
- Backed by Borla’s Million-Mile Warranty for peace of mind and quality assurance

























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