Borla · New
Borla Universal Pro-XS Muffler Oval 3in Inlet/ 2.5in Dual Outlet Transverse Flow Notched Muffler
MPN 400499 · Store SKU bor400499
Supplier stock checked 11/8/2026, 6:01:40 AM UTC. Adding a part does not reserve it.
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Product details
Transverse Flow design. Transverse flow mufflers were originally designed for GM F-Body Camaros and Firebirds. On these vehicles they were mounted behind the rear axle and were parallel to the axle. This muffler can also be used to create custom systems on other vehicles. Single 3" Offset Inlet/ Dual 2.5" Offset Outlets. The inlet and one outlet are on one end of the muffler, the second outlet is on the opposite end. Notched necks for clamp-on installation using 1" wide band style clamps (clamps not included). 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. Alternate muffler with Un-Notched necks is 40474. If clamping, use 3" band clamps 18004 & 18006. 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. Borla Performance has once again proven why we have a led the aftermarket performance exhaust industry for over 30 years. Borla Performance Industries; the original pioneers of high quality; austinetic stainless steel free flow exhaust utilizes patented award and race winning technology to deliver quality; sound; performance gains; and enhanced fuel economy. All with an easy bolt on installation. All Borla street products carry an unsurpassed written million-mile warranty. Specialty Muffler - Transverse Flow - Single 3" Offset Inlet/ Dual 2.5" Offset Outlets (One Outlet On Same End As Inlet And One Outlet On Opposite End) 6" x 10.25" Oval x 19" Long Body 24" OAL. Univ. Part. Reversible Design. Notched Necks. Specialty Muffler - Notched Necks Universal Performance Mufflers
Manufacturer fitment & guides
Check 400499 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
