Borla 400843 CrateMuffler S-Type Muffler for Chevrolet Small Block 350, 383, and 406 V8 Engines

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 Touring sound. Muffler dimensions 3" Offset Inlet/ 3" Center 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" Center Outlet, 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length, S-Type.

• 3" Offset Inlet/ 3" Center 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 400843 CrateMuffler is engineered specifically for Chevrolet Small Block 350, 383, and 406 CID V8 crate and custom-built engines. This directional muffler features a 3-inch offset inlet and 3-inch center outlet, delivering Borla’s distinctive S-Type exhaust sound while helping reduce or eliminate unwanted drone on specified applications. The outlet is identified by the mounting bracket welded to the end cap, making correct installation straightforward.

Built from premium T-304 stainless steel, the Borla CrateMuffler offers excellent resistance to corrosion, heat, and long-term exhaust-system wear. Precision CNC manufacturing supports consistent fitment and reliable performance. Its oval body design provides a practical solution for custom exhaust systems, while the tuned internal construction helps balance aggressive sound with improved driving comfort. For a quieter Touring sound level, Borla resonator 400939 can be added where application conditions permit.

The Borla 400843 is designed for automotive exhaust applications and is not CARB approved. Fitment is intended for Chevrolet Small Block 350, 383, and 406 CID V8 engine families; custom exhaust routing and mounting may be required depending on the vehicle and installation. As with all Borla CrateMufflers, this model is backed by Borla’s Million-Mile Warranty, reflecting the brand’s focus on durability, precision, and long-term performance.

What's Included

• One Borla 400843 CrateMuffler S-Type muffler

Features:

• Engine-Specific Tuning: Designed for Chevrolet Small Block 350, 383, and 406 CID V8 crate and custom-built engines.
• S-Type Sound: Produces Borla’s classic aggressive exhaust tone while helping reduce or eliminate drone on specified applications.
• Directional Flow Design: The outlet end is identified by the welded mounting bracket for proper installation orientation.
• Premium Stainless Construction: Made from durable T-304 stainless steel for strong corrosion resistance, heat tolerance, and long service life.

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