The Borla resonator is a compact bottle or bullet style resonator that lowers the sound pressure level of a Borla S-Type CrateMuffler or serves as a universal resonator in any system of this diameter. The straight-through design attenuates overall sound roughly 2 to 3 dB(A) without degrading performance, and there is no logo embossment on this part. The un-notched necks are made for weld-in installation (3 inch wide band clamps 18004 if clamping), and the reversible design adds flexibility. It is built from 100 percent welded T-304 austenitic stainless steel with high-temperature CFF acoustic packing and a natural mill finish. Borla exhaust is handmade in the USA and backed by the Borla Million-Mile Warranty.
Specifications:
- System type: universal bullet / bottle resonator, reversible design
- Inlet: 2.5 inch center
- Outlet: 2.5 inch center
- Body: 3.5 inch round
- Body length: 10 inch
- Overall length: 14 inch
- Neck style: un-notched for weld-in (3 inch band clamps if clamping)
- Material: T-304 austenitic stainless steel
- Construction: 100 percent welded
- Made in the USA
- Part number: 400938
FAQ
What does the Borla 400938 resonator do?
It is a universal straight-through resonator that reduces overall exhaust sound by roughly 2 to 3 dB(A) without hurting performance. It is often paired with a Borla S-Type CrateMuffler to reach the mellower Touring sound level, or used as a general resonator in any compatible system.
How does it install?
The un-notched necks are designed for weld-in installation, or for clamping with 3 inch wide band clamps (part 18004). The reversible design allows either orientation.
Is this a 50-state emissions legal or street legal part?
This is a universal weld-in exhaust component, not a complete vehicle-specific system. Emissions compliance and street legality depend on the complete exhaust system and the specific vehicle it is installed on, so a universal part sold on its own carries no standalone emissions certification. Confirm the requirements for your state and application before installing.
Where is it made and is it warrantied?
It is built in the USA from T-304 austenitic stainless steel and is backed by the Borla Million-Mile Warranty.
