Borla CrateMuffler Universal Resonator BOR400937, 2.25-Inch Center Inlet and Outlet

Perfect for applications with limited space. If you want to lower the sound pressure level (SPL) of your CrateMuffler(r)s, you can install this resonator. This compact bottle / bullet style resonator can also be used as a universal resonator in any system of this diameter. The Resonator is designed to attenuate overall sound. This is perfect for customers looking to reduce the sound level 2-3 dB(A). This straight-through design will not degrade the performance of your vehicle. Resonator dimensions 2.25" Center Inlet/ 3" Center Outlet, 4" Round, 10" Long Body 15" Overall Length. Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18003. Reversible design for installation flexibility. High-quality T-304 austenitic stainless steel for superior corrosion resistance. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. There is no logo embossment on this part. Best of all, it's made in the USA and backed by BORLA(r)'s Million-Mile warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand. Resonator - Sound Level N/A Resonator - 2.25" Center Inlet/ 2.25" Center Outlet 3.5" Round x 10" Long Body 14" Overall Length Universal Part Reversible Design.

• Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18003.
• Use with BORLA(r) S-Type CrateMuffler(r) to achieve the Touring sound level
• Universal bottle / bullet style resonator. Reversible design.
• Compact size is perfect for applications with limited space

The Borla CrateMuffler Universal Resonator, part number BOR400937, is designed for exhaust systems that need effective sound control in a compact package. Its bottle-style, straight-through construction helps attenuate overall exhaust volume by approximately 2–3 dB(A) while preserving exhaust flow and vehicle performance. The reversible design provides installation flexibility, making it suitable for a wide range of universal exhaust applications using compatible tubing.

Manufactured from high-quality T-304 austenitic stainless steel, this Borla resonator delivers excellent corrosion resistance and long-term durability. Its 100% welded construction adds strength, while high-temperature continuous-filament fiber acoustic material helps manage sound without restricting flow. The natural mill finish can be brushed or polished before installation, and the part has no logo embossment. Un-notched necks are intended for weld-in installation; for clamped installation, Borla recommends 3-inch-wide band clamps, part number 18003. When used with a Borla S-Type CrateMuffler, this resonator can help achieve a Touring sound level.

Specifications: Universal automotive resonator; Borla part number BOR400937; 2.25-inch center inlet and outlet; 3.5-inch round body; 10-inch body length; 14-inch overall length; straight-through free-flow design; reversible installation orientation. Made in the USA and backed by Borla's Million-Mile Warranty. Fitment is universal and depends on exhaust tubing size, available space, and installation method. Professional installation is recommended to ensure proper alignment, welding, clearance, and leak-free operation.

What's Included: One Borla CrateMuffler Universal Resonator. Clamps, welding materials, and other installation hardware are not included.

Features:

• Compact bottle-style resonator is ideal for exhaust applications with limited installation space.
• Reduces overall exhaust sound by approximately 2–3 dB(A) while maintaining free-flow performance.
• Straight-through, reversible design supports flexible installation without significant flow restriction.
• T-304 stainless steel construction with fully welded seams and high-temperature acoustic material provides durable, corrosion-resistant sound control.

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