Borla CrateMuffler Resonator Option Universal 2.5-Inch Center Inlet to 2.5-Inch Center Outlet T-304 Stainless Steel Round Performance Bullet Resonator (400938)
Achieve premium acoustic refinement and target harsh frequency peaks with the Borla CrateMuffler Performance Bullet Resonator. Masterfully engineered to lower the overall sound pressure level without strangling exhaust flow, this universal inline acoustic unit is the perfect solution for custom builders looking to mellow down a loud exhaust system. This highly efficient specialty unit is designed to integrate seamlessly with standard performance setups, working effectively to attenuate harsh raw exhaust volumes by an overall 2 to 3 dB(A). At its mechanical core, this premium inline resonator breaks away from restrictive chamber layouts by incorporating Borla's cutting edge straight through internal geometry. This innovative layout features a high velocity perforation core that optimizes gas flow and exhaust velocity, ensuring that dropping the decibel level will not degrade the performance or power delivery of your vehicle.
The structural engineering of the Borla 400938 addresses long term durability and installation problems beneath tight chassis floors through a 100% welded, heavy gauge setup. Enclosed in a compact bullet style 3.5-inch to 4-inch round by 10-inch long barrel case with a total 14-inch to 15-inch footprint, this robust assembly delivers excellent space optimization when tucked into tight muscle car floors, classic truck frames, or street rod undercarriages. Inside, the core features a specialized high temperature continuous filament fiber acoustic packing matrix, which absorbs high frequency cabin drone and harsh tones while easily resisting high thermal degradation from high performance engine setups. Built completely from CNC machined, aircraft quality, premium grade T-304 austenitic stainless steel, this heavy duty canister provides absolute maximum resistance against corrosion and thermal fatigue. Delivering bulletproof structural stability backed by Borla's legendary Million Mile warranty, this clean canister features a clean natural mill finish with no logo embossment, allowing builders to custom brush or mirror polish the body before final installation.
Straight Through Flow Dynamics & Modular Sound Control: Unlike basic factory replacements or universal multi chambered mufflers that choke velocity and hurt horsepower, this high flow performance resonator maintains a constant inner diameter path. While it can be used as a standalone universal sound absorber in any custom setup of this matching diameter, it is explicitly optimized to pair with Borla S-Type CrateMuffler systems to smoothly shift the acoustic profile into a more mellow, neighborhood friendly Touring sound volume level.
Fabrication Installation Guideline Note: This high performance universal CrateMuffler bullet resonator features a symmetric, fully reversible design layout, giving chassis fabricators total flexibility to position and flip the canister in either direction for clean routing. This model is built with smooth, unnotched attachment collars engineered explicitly for a permanent, clean weld on installation by a professional fabricator. For setups requiring a removable slip fit connection, wide two bolt style performance exhaust band clamps can be utilized.
Features
- Modular CrateMuffler Resonator Technology: Purpose built to reduce high velocity sound pressure levels by 2 to 3 dB(A) for premium inline acoustic control
- Optimized for Touring Acoustic Conversions: Engineered to pair perfectly with Borla S-Type CrateMuffler configurations to successfully achieve a mellow Touring sound profile
- High Flow 2.5-Inch Core Velocity: Straight through internal geometry layout eliminates backpressure bottlenecks to protect vehicle horsepower and torque delivery
- Fully Reversible Design Profile: Bi-directional internal architecture allows the canister to be flipped or rotated in either direction to simplify tight undercar routing
- Continuous Filament Fiber Acoustic Matrix: Premium high temperature CFF packing material delivers elite sound control and extreme resistance to thermal degradation
- Compact Bottle Style Architecture: Streamlined round body shape tucks cleanly into tight chassis pockets and limited clearance spaces
- Heavy Duty 100% Welded Body: Fully welded seams deliver maximum structural strength to resist extreme backfire pressures and track vibrations
- Constructed completely from premium grade T-304 austenitic stainless steel for permanent structural integrity and ultimate rust resistance over low grade 400 series hardware options
- Clean Exterior Styling: Natural mill finish features no embossed logos and can be custom brushed or mirror polished prior to final installation
- Proudly Manufactured in the USA: Built in America using high precision CNC manufacturing processes to guarantee flawless fitment and elite race proven quality
Detailed Fitment Breakdown & Application Parameters
Universal Fitment Parameters & Structural Boundaries:
This premium CrateMuffler optional bullet resonator does not feature a traditional direct year, make, and model automotive catalog listing. Instead, it is a specialized **Universal Fit** acoustic component targeted and engineered for custom vehicle platforms, hot rods, restomods, street machines, and racing vehicles using custom exhaust layouts requiring a heavy duty 2.5-inch inline sound absorber.
Target Compatibility & Application Profiles:
- Fits universal exhaust configurations running a 2.5-inch outer diameter exhaust piping setup
- Specifically optimized to pair inline with Borla S-Type CrateMuffler systems to attenuate overall sound pressure into a deep Touring tone
- Ideally suited for custom fabricated dual or single exhaust projects requiring a compact footprint to kill interior cabin drone and rasp
Sizing, Connection & Dimensional Details:
Fits your project layout across these exact structural specifications:
- Inlet Connection Size: 2.50-Inch internal diameter center port neck
- Outlet Connection Size: 2.50-Inch internal diameter center port neck
- Resonator Case Configuration: Round bullet/bottle structural shape (3.50-Inch to 4.00-Inch outer diameter range)
- Resonator Case Body Length: 10.00 Inches of primary high temperature sound control coverage
- Overall Resonator Total Length: 14.00 to 15.00 Inches from inlet tip to outlet tip boundary
- Internal Architecture Matrix: Symmetric, reversible straight through high flow performance configuration
- Material Grade Composition: Authentic T-304 Austenitic Stainless Steel with a natural mill finish
Important Application Notes:
* Premium Materials: Built entirely with authentic T-304 stainless steel to deliver superior rust resistance and durability over lower grade T-400 series or aluminized hardware choices.
* Installation Flexibility: This is a non directional component. It can be installed in either flow direction to accommodate tricky undercar exhaust routing layouts.
* Fabrication Requirements: Features smooth, unnotched collars engineered for weld-in installation. Professional fabrication, welding, or wide two bolt style band clamps are necessary for a perfect undercar fit.
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
