Borla CrateMuffler SBC Hot 350/383/406 V8 S-Type Muffler, 3-Inch Offset Inlet and Outlet, Part Number 400840

BORLA(r)'s CrateMuffler(r) is the world's first muffler purpose-built to optimize the sound & power of crate and custom built motors. The mufflers are directional. The outlet can be identified by the mounting bracket welded to the endcap. This muffler is tuned for the Chevrolet Small Block 350/ 383/ 406 CID V8 engine family. The directional design provides the classic S-Type sound and will dramatically reduce, or eliminate drone on specified applications. Add resonator 400939 to attain the mellow Touring sound level. Muffler dimensions 3" Offset Inlet/ 3" Offset Outlet 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit and best of all, BORLA(r) stands behind every CrateMuffler(r) with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand. CrateMuffler, Chevrolet Small Block 350/ 383/ 406 CID V8 High Output, 3" Offset Inlet/ 3" Offset Outlet 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length, S-Type.

• 3" Offset Inlet/ 3" Offset Outlet 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length
• When installed on cataloged applications, they will reduce, or eliminate drone
• Mufflers have directional flow. Outlet end has mounting bracket on it.
• Add resonator 400939 to attain the Touring sound level
• CrateMuffler(r)s are tuned for specific engines

The Borla CrateMuffler Part Number 400840 is a directional performance muffler engineered specifically for Chevrolet Small Block 350, 383, and 406 CID V8 crate and custom-built engines. Tuned to deliver Borla’s classic S-Type sound, it provides an aggressive, performance-oriented exhaust note while helping reduce or eliminate unwanted drone on specified applications. The outlet is identified by the mounting bracket welded to the end cap, making proper installation easier.

Designed for high-output applications, this CrateMuffler features a 3-inch offset inlet and 3-inch offset outlet with an oval body measuring 4.35 inches by 9.10 inches and a 14-inch body length. The overall length is 19 inches. Its directional flow path is matched to the intended engine family for consistent sound and performance. For a smoother, more subdued Touring sound level, Borla recommends adding resonator Part Number 400939.

Constructed from premium T-304 stainless steel, the Borla 400840 offers excellent corrosion resistance, long-term durability, and reliable performance under demanding exhaust conditions. Computer numerical control manufacturing supports accurate construction and dependable fitment. Borla backs its CrateMuffler line with a Million-Mile Warranty, reflecting the brand’s focus on durable, high-quality exhaust components.

• Application: Chevrolet Small Block 350, 383, and 406 CID V8 crate and custom-built engines
• Configuration: Directional muffler with outlet identified by the end-cap mounting bracket
• Sound level: Borla S-Type performance sound with reduced or eliminated drone on specified applications
• Optional tuning: Add Borla resonator Part Number 400939 for a mellow Touring sound

What's Included: One Borla CrateMuffler Part Number 400840. Clamps, hangers, tubing, gaskets, and other installation hardware are not included unless specified by the installer or application.

Features:

• Engine-specific tuning: Designed for Chevrolet Small Block 350, 383, and 406 CID V8 crate and custom-built engines.
• S-Type sound: Delivers Borla’s classic performance exhaust tone with reduced or eliminated drone on specified applications.
• Directional flow design: Provides application-specific exhaust flow, with the outlet identified by the mounting bracket on the end cap.
• Premium T-304 stainless steel construction: Provides strong corrosion resistance, durability, and dependable long-term performance.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1