The Borla ProXS Universal Muffler is a straight-through universal muffler for custom and replacement exhaust builds. It is made from T-304 austenitic stainless steel with fully welded seams. Its configuration, dimensions and neck style are listed in the specifications on this page. This listing is Borla part 400487.
The muffler ships on its own; clamps, hangers and connecting pipe are sold separately.
Features
True straight-through design
Borla builds every ProXS muffler without chambers or baffles, so exhaust passes straight through the core.
Reversible for flexible layouts
Either end can serve as the inlet, which makes it easier to fit the muffler into a custom system.
T-304 stainless, fully welded
The case is T-304 austenitic stainless steel with 100% welded construction for corrosion resistance and strength.
High-temperature acoustic packing
Continuous-filament fiber packing inside the case controls sound while standing up to exhaust heat.
Natural finish, ready to dress
The case ships in a natural mill finish, ready to brush or polish before installation.
Million-Mile Warranty coverage
Every ProXS muffler comes with Borla's Million-Mile Warranty.
Fitment & Compatibility
Fit guidance: This part is not tied to one vehicle; check the dimensions in the Specifications before ordering.
Specifications
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Brand: Borla
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Series: ProXS
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Warranty: Borla Million-Mile Warranty (one year on carbon fiber, black coatings, tip finishes and moving parts)
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Material: T-304 austenitic stainless steel
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Design: Straight-through, reversible
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Acoustic Material: Continuous-filament fiber (CFF)
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Construction: 100% welded
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Finish: Natural mill finish
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Muffler Config: Center/Dual
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Muffler Shape: Oval
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Muffler Tubing Size: 3" Inlet/ Dual 2.5" Outlet
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Case Dimensions: 19" X 4" X 9.5"
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Muffler Overall Length: 24"
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Part number: 400487
California Proposition 65
WARNING: This product in the physical form it is sold does not present a hazard. However, operations including, but not limited to welding, brazing or thermal cutting can expose you to chemicals including chromium, nickel, cobalt, arsenic, cadmium and lead, which are known to the State of California to cause cancer, birth defects and other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Installation
Type: Universal straight-through muffler · Install: Welded or clamped into a custom exhaust · Tools: Exhaust fabrication tools
Install this muffler by welding or clamping at the necks to suit its neck style, listed in the specifications. Do not weld to the case or end caps.
Resources
An installation guide for this part number is not available to download. Our team can answer installation questions before you order; contact us with the part number.
Warranty, Shipping & Returns
Warranty. Borla covers its products under the Million-Mile Warranty, which protects the original purchaser of record, on the vehicle the part was first installed on, against defects in materials or workmanship for a million miles. Carbon fiber, black coatings, tip finishes and moving parts such as valves and actuators carry a one-year term, and appearance blemishes from weather, road hazards, lack of maintenance or temperature extremes are not covered. When Borla's inspection confirms a defect, Borla repairs or replaces the part at its option. The warranty does not pay for removal or reinstallation, does not apply to parts damaged by accident, abuse, misuse, misapplication or modification, and does not cover sound level, because sound is a matter of taste. Shipping. The carrier and ship method are set by the size and weight of the carton when the order is placed; long exhaust systems ship in oversize cartons. Inspect on delivery. Please inspect the carton and the part as soon as it arrives, before installation, and report any shipping damage to us right away so we can make it right.
Returns. Unused items in their original packaging can be returned within 30 days of delivery. If an item arrives damaged, defective or wrong, return shipping is on us. See our Returns & Refunds Policy, or email support@prestigetruck.com with any question.
About Borla
Borla got its start in 1978 building exhaust systems for concours-grade Rolls-Royce and Ferrari classics. Over more than four decades that work grew into a performance exhaust brand for the cars and trucks people drive today.
More than 300 Borla employees design and build the product line, and Borla says the product is genuinely made in the USA and sold worldwide. GM, Ford and Toyota are among the vehicle makers that have sourced factory-installed aftermarket exhaust systems from Borla.
At its test and development center, Borla works through muffler body shapes, internal core layouts, flow and acoustics, and that effort has produced a long list of US patents. Many of the people who build and support Borla parts spend weekends competing at drag strips, car shows and off-road events.
