Borla 400939 CrateMuffler Universal 3" Resonator 3.5" Round x 10"

Product Overview

• Borla 400939 CrateMuffler® Universal Performance Resonator (3" Inlet/3" Outlet)

Features

• Premium T-304 stainless steel for corrosion resistance and durability
• 3" inlet and 3" outlet diameter - ideal for 3" exhaust systems
• 3.5" round body with 10" length for effective drone reduction
• Designed for custom exhaust builds and crate engine applications
• Helical internal design helps smooth exhaust pulses and reduce drone
• Mandrel-bent internal flow path maintains performance and minimizes backpressure
• Universal fit - weld or clamp into your exhaust system as needed
• Backed by Borla's Million-Mile Warranty on construction quality

Specifications

• Part Number: 400939
• Type: Universal Performance Resonator
• Material: T-304 Stainless Steel
• Inlet Diameter: 3"
• Outlet Diameter: 3"
• Body Diameter: 3.5"
• Body Length: 10"
• Fitment Type: Universal / custom exhaust systems
• Sound Control: Reduces unwanted drone in performance exhausts

Included Components

• 1x Borla 400939 CrateMuffler® universal resonator

Product Description

The **Borla 400939 CrateMuffler® Resonator** is a universal exhaust component built to refine and smooth the sound of custom and high-performance exhaust systems. With a **3" inlet and outlet** and a **3.5" round body measuring 10" long**, this resonator is engineered to reduce unwanted drone while maintaining strong exhaust flow. It's ideal for use in custom hot rod setups, racing builds, and **crate engine exhaust systems** where sound tuning and drone control matter.

Constructed from premium T-304 stainless steel with precision CNC-machining, the 400939 helps smooth exhaust pulses while preserving performance. Its helical internal design and smooth mandrel flow path reduce harsh resonances without significantly restricting flow - making it a popular addition ahead of performance mufflers or within bespoke exhaust piping. Because this part is **universal**, it can be installed by welding or clamping into your exhaust system where a 3" resonator section is needed. Backed by Borla's **Million-Mile Warranty**, this resonator offers both durability and effective tone refinement for custom builds.