Borla Boomer Muffler Thumper Oval 2-1/4in In 4in Side Round Out

SKU: BOR40057

Mufflers

BOR Boomer Mufflers

Borla

Borla Boomer Muffler Thumper Oval 2-1/4in In 4in Side Round Out

SKU: BOR40057

Mufflers

BOR Boomer Mufflers

LOW STOCK! Est Ship 3-5 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.

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Description

BORLAÂ® BOOMERSâ„¢ â€” Full blown, high-tech, dyno and race-inspiredmufflers for the street or track. These eye-poping, fully polished mufflersutilize BORLAs patented race-winning technology. They boost horsepower7-10 while adding head-turning sound. Available in a variety ofuniversal-fit styles, BORLAÂ® Boomers are made of high quality300 Series austenitic stainless steel and are backed by aMillion Mile Warranty

Product Overview

Borla Boomers are full-blown, high-tech, dyno and race-proven mufflers for the street or track. These eye-popping, fully polished, T-304 stainless steel mufflers feature integrated polished tips, and utilize Borla's patented race-winning technology for improved exhaust flow. In addition to adding head-turning sound, they also add a modest boost in horsepower. They utilize 100% welded construction for strength. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Available in a variety of universal-fit styles, Borla Boomers are made in the USA from aircraft-grade high-quality T-304 austenitic stainless steel and include a Million-Mile Warranty.

Product Details

Body Height (in.):	7.88
Body Height:	7.880 in.
Body Length (in.):	14
Body Length:	14.000 in.
Body Width (in.):	4.5
Body Width:	4.25 in.
Construction:	All Welded
Description:	BorlaÃ‚Â® Boomers Thumper Muffler
Grade Type:	Performance
Inlet Connection Type:	Pipe
Inlet Position:	Center
Inlet Size (in.):	2.25
Inlet Type:	Single Center
Main Piping Diameter:	2.250 in.
Material:	T-304 Stainless Steel
Muffler Count:	1
Off Road Use Only:	No
Outlet Outside Diameter:	2.250 in.
Outlet Position:	Center
Outlet Size (in.):	2.25
Outlet Type:	Single Center Outlet
Overall Length (in.):	19
Overall Length:	23.50 in.
Part Number:	bor40057
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:	Polished T-304 Stainless Steel
Title Extended:	Thumper - 2.25in Inlet Pipe - Single 4in Round Tip - T-304 Stainless Steel Boomer Muffler Part # 40057
Title:	Boomers Muffler Thumper 2.25in Center Inlet/ 4in Single Round Tip 4.5in x 7.88in Oval x 14in Long Body

Application Summary

Thumper Boomers Muffler - 2.25" Center Inlet/ Single 4" Round Tip, 4.25" x 7.88" Oval x 14" Long Body 23.5" Overall Length. Universal Part.

Part Type

Exhaust Muffler

Data: v4.2 - Upd: 2026-10-13 09:01:33

Features

Fully polished
Integrated tips
Universal muffler

Specifications

Product Attributes - UPC: 808422400572
Product Attributes - Brand: Borla
Product Attributes - Quantity: Sold individually.
Product Attributes - Part Type: Mufflers
Product Attributes - Case Shape: Oval
Product Attributes - Reversible: No
Product Attributes - Width (in.): 7.850 in.
Product Attributes - Outlet Style: Rounded
Product Attributes - Product Line: Borla Boomer Mufflers
Product Attributes - Inlet Location: Center
Product Attributes - Inlet Quantity: 1
Product Attributes - Muffler Finish: Polished
Product Attributes - Outlet Location: Center
Product Attributes - Outlet Quantity: 1
Product Attributes - Thickness (in.): 4.125 in.
Product Attributes - Muffler Material: 304 stainless steel
Product Attributes - Inlet Diameter (in.): 2.25 in.
Product Attributes - Overall Length (in.): 19.00 in.
Product Attributes - Internal Construction: Straight-through baffled
Product Attributes - Outlet Diameter (in.): 4.00 in.
Product Attributes - Case Exterior Length (in.): 14.00 in.
Product Attributes - Manufacturer's Part Number: 40057

Reference Information

Brand Name/s	Borla
StreetFX SKU	bor40057
SFX Item ID	4224858
Supplier Item Code	4224858
Manufacturer SKU	40057
Manufacturer UPC	808422400572
Alternative References	2-1/4in, 4in