Home / Shop / Borla Transverse Flow Notched Muffler - Oval Single Inlet/Dual Outlet 2.5in 19in x 10.5in x 5.5in

Borla Transverse Flow Notched Muffler - Oval Single Inlet/Dual Outlet 2.5in 19in x 10.5in x 5.5in

SKU: BOR400498

Mufflers

BOR Universal Mufflers...

Borla

Borla Transverse Flow Notched Muffler - Oval Single Inlet/Dual Outlet 2.5in 19in x 10.5in x 5.5in

SKU: BOR400498

Mufflers

BOR Universal Mufflers...

Limited Availability from MFR Limited stock available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical orders of this part. This item is not held in our own warehouse, and availability and release timing may vary depending on manufacturer stock movements and processing at the time of ordering.

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Description

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 2.5" Offset Inlet/ Dual 2.5" Offset Outlets. The inlet and one outlet are on one end of the muffler, and 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. 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.

Product Overview

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 2.5" Offset Inlet/ Dual 2.5" Offset Outlets. The inlet and one outlet are on one end of the muffler, and 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 will never rust. 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. 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.

Features and Benefits

Universal muffler. Reversible design.
Alternate muffler with Un-Notched necks is 40477. If clamping, use band clamps 18325.
Transverse flow design, originally designed for F-Body Camaro and Firebirds

Product Details

Body Height (in.):	5.5
Body Height:	5.500 in.
Body Length (in.):	19
Body Length:	19.000 in.
Body Width (in.):	10.25
Body Width:	10.250 in.
Construction:	All Welded
Description:	Universal Performance Mufflers
Grade Type:	Performance
Inlet Connection Type:	Pipe
Inlet Outside Diameter:	2.500 in.
Inlet Position:	Offset
Inlet Size (in.):	2.5
Inlet Type:	Single Offset
Main Piping Diameter:	2.500 in.
Material:	T-304 Stainless Steel
Muffler Count:	1
Off Road Use Only:	No
Outlet Outside Diameter:	2.500 in.
Outlet Position:	Dual Rear
Outlet Size (in.):	2.5
Outlet Type:	Dual Offset Outlet
Overall Length (in.):	23
Overall Length:	23.000 in.
Part Number:	bor400498
Position:	N/A
Prop 65 (C, R or CR):	CR
Prop 65 - Long Label:	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 towww.P65Warnings.ca.gov
Prop 65 - Short Label:	Proposition 65 Warning.JPG
Prop 65 Yes/No:	Yes
Shape:	Oval
Tip / Outlet Finish:	N/A
Title Extended:	Specialty Muffler Transverse Flow 2.5 in. Single Inlet/ 2.5 in. Dual Outlet 6 in. x 10.25 in. Oval x 19 in. Long Body NotchedNecks Part # 400498
Title:	Specialty Muffler Transverse Flow 2.5 in. Single Inlet/ 2.5 in. Dual Outlet 6 in. x 10.25 in. Oval x 19 in. Long Body NotchedNecks

Application Summary

Specialty Muffler - Transverse Flow - Single 2.5" 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" Overall Length. Universal Part. Reversible Design. Notched Necks.

Part Type

Exhaust Muffler

Data: v4.2 - Upd: 2026-10-13 15:27:10

Features

Alternate muffler with Un-Notched necks is 40477. If clamping, use band clamp 18004.
Notched necks are designed for clamp in installation, use band clamp 18004
Transverse flow design, originally designed for F-Body Camaro and Firebirds
Universal muffler. Reversible design.

Specifications

Product Attributes - Brand: Borla
Product Attributes - Manufacturer's Part Number: 400498
Product Attributes - Part Type: Mufflers
Product Attributes - Product Line: Borla Specialty Mufflers
Product Attributes - UPC: 808422004985
Product Attributes - Muffler Material: 304 stainless steel
Product Attributes - Inlet Diameter (in.): 2.50 in.
Product Attributes - Outlet Diameter (in.): 2.50 in.
Product Attributes - Inlet Quantity: 1
Product Attributes - Outlet Quantity: 2
Product Attributes - Inlet Location: Offset
Product Attributes - Outlet Location: Offset
Product Attributes - Case Shape: Oval
Product Attributes - Reversible: No
Product Attributes - Muffler Finish: Natural
Product Attributes - Case Exterior Length (in.): 19.00 in.
Product Attributes - Thickness (in.): 5.500
Product Attributes - Width (in.): 10.250 in.
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: Muffler is a crossflow design.

Reference Information

Brand Name/s	Borla
StreetFX SKU	bor400498
SFX Item ID	4224818
Supplier Item Code	4224818
Manufacturer SKU	400498
Manufacturer UPC	808422004985
Alternative References	2.5in, 19in, 10.5in, 5.5in