BMW M340i Exhaust: Axle-Back vs Cat-Back Comparison
Explore the differences between axle-back and cat-back BMW M340i exhaust systems, focusing on sound, drone, and daily usability for your vehicle.
By Lee Shahin ·
BMW M3 exhaust systems
81 exhaust systems for the G80 BMW M3 (S58 3.0L twin-turbo inline-six) from 19 brands. Cat-back and axle-back systems, mufflers, tips and valve controllers. A cat-back replaces the exhaust from the catalytic converter rearward. An axle-back replaces only the rear section.
Before you order
- Fitment is listed by engine and drivetrain. Confirm both on the retailer page.
- Tip finish and size are often a separate selection on the retailer page.
- Sound-level rules vary by state. A louder system can fail an inspection or roadside check.
- Listings are read from the retailer's G80 M3 (S58 3.0L) category. Competition, xDrive and Touring (G81) cars can use different parts. Confirm model, drivetrain and model year on the retailer page before ordering.
Brands on this page: Valvetronic Designs (26), AWE (7), Dinan (6), Milltek Sport (6), Active Autowerke (5), Akrapovic (4), ECS (4), XForce (4), AFE (3), Armytrix (3), Turner Motorsport (3), MBRP (2), Supersprint (2), ARM Motorsports (1), CTS (1), Eisenmann (1), Genuine BMW M Performance (1), MAD (1), Scorpion (1).
Axle Back (21)
Active Autowerke · Part no. 11-086C
S58 Axle-Back Exhaust With Carbon Fiber Tips (11-086C)
Deep exhaust tone with the functionality of stock valve control.
Active Autowerke · Part no. 11-086B
S58 Axle-Back Exhaust With Matte Black Tips (11-086B)
Deep exhaust tone with the functionality of stock valve control.
Active Autowerke · Part no. G8XAXLBCKSTBRU
Valved Axle-Back Exhaust - Stainless Brushed Tips
Deep exhaust tone with the functionality of stock valve control.
Active Autowerke · Part no. 11-086CB
Valved Rear Axle-back Exhaust - Carbon Over Black Chrome Tips
Unleash the aggressive sound of your S58 engine with Active Autowerke's valved rear exhaust!
Dinan · Part no. D662-9249
3.00" Clamp Low Profile 74-79MM
Dinan · Part no. D660-0093-BLK
Dinan Valved Axle Back - 2021-2023 BMW M3/M4 - Black Tips
Improve and refine the sound of your G80/G82 with this valved axle-back exhaust from Dinan!
Dinan · Part no. D660-0093
Dinan Valved Axle-Back Exhaust - 2021-2023 BMW M3/M4 - Polished Tips
Improve and refine the sound of your G80/G82 with this valved axle-back exhaust from Dinan!
Eisenmann · Part no. B5470.01104.31
Eisenmann Sport Performance Muffler System - Chrome Tips
Stay ahead of the competition with the performance gains that you'll receive from this sport exhaust system.
Milltek Sport · Part no. SSXBM117X
Performance Axle Back Exhaust System
Enhance the sound of your BMW's exhaust with this exhaust system from Milltek Sport
Scorpion · Part no. SBM084CF
Scorpion Axle-Back System With Electronic Valves
Built to last with 304 stainless steel and engineered for dyno-proven power gains. Scorpion proves performance exhaust doesn't need to be intolerably loud to sound great.
Valvetronic Designs · Part no. G8XM3AXLBRBLK
Valved Sport Axle-Back Stainless Exhaust System - 3.5" Black Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLBRBRSH
Valved Sport Axle-Back Stainless Exhaust System - 3.5" Brushed Steel Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLBRBRT
Valved Sport Axle-Back Stainless Exhaust System - 3.5" Burnt Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLBRFC
Valved Sport Axle-Back Stainless Exhaust System - 3.5" Forged Carbon Fiber Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLBRRC
Valved Sport Axle-Back Stainless Exhaust System - 4.0" 1x1 Carbon Fiber Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTIBLK
Valved Sport Axle-Back Titanium Exhaust System - 3.5" Black Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTIBRSH
Valved Sport Axle-Back Titanium Exhaust System - 3.5" Brushed Steel Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTIBRT
Valved Sport Axle-Back Titanium Exhaust System - 3.5" Burnt Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTIFC
Valved Sport Axle-Back Titanium Exhaust System - 3.5" Forged Carbon Fiber Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTIRC
Valved Sport Axle-Back Titanium Exhaust System - 4.0" 1x1 Carbon Fiber Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Valvetronic Designs · Part no. G8XM3AXLTITIBRT
Valved Sport Axle-Back Titanium Exhaust System - 4.0" Raw Titanium Burnt Tips
Upgrade your M3/M4's exhaust to make the S58's naturally aggresive tone shine!
Cat Back (19)
AFE · Part no. 49-36351-B
MACH Force-Xp Stainless Steel Cat-Back Exhaust System - Black Tips
Add power, sound and unique style to your BMW with this cat-back system from AFE!
AFE · Part no. 49-36351-C
MACH Force-Xp Stainless Steel Cat-Back Exhaust System - Carbon Tips
Add power, sound and unique style to your BMW with this cat-back system from AFE!
AFE · Part no. 49-36351-P
MACH Force-Xp Stainless Steel Cat-Back Exhaust System - Polished Tips
Add power, sound and unique style to your BMW with this cat-back system from AFE!
AWE · Part no. 3025-43480
AWE SwitchPath Catback Exhaust - Chrome Silver Tips
Free up power and unleash your BMW's naturally aggressive S58 exhaust tone!
AWE · Part no. 3025-42480
AWE SwitchPath Catback Exhaust - Diamond Black Tips
Free up power and unleash your BMW's naturally aggressive S58 exhaust tone!
AWE · Part no. AWEG8XSP
AWE SwitchPath Catback Exhaust System - Chrome Silver Or Diamond Black Tips
Maximum flow and minimal drone! Featuring AWE's SwitchPath valve technology.
AWE · Part no. 3020-43482
AWE Track Edition Catback Exhaust - Chrome Silver Tips
Go even more aggressive with your BMW's exhaust!
AWE · Part no. 3020-42482
AWE Track Edition Catback Exhaust - Diamond Black Tips
Go even more aggressive with your BMW's exhaust!
AWE · Part no. AWEG8XTRK
AWE Track Edition Catback Exhaust System - Chrome Silver Or Diamond Black Tips
Free up power and unleash your BMW's naturally agressive S58 exhaust tone!
Akrapovic · Part no. P-HF1384
Akrapovic Sound Kit - G80/G82 M3/M4
For use with the Akrapovic Exhaust Suite - Use the Sound Remote Controller or the new smartphone app (for iOS and Android) to regulate the valves.
Akrapovic · Part no. BM/T/21H-C
Akrapovic Titanium Slip On Exhaust With Classic Carbon Fiber Tips - G80/G82 M3/M4
Akrapovic has achieved power gains of 10.9 HP at 6,000 rpm and torque increases of 10.3 lb/ft Torque at 6,000 rpm
Akrapovic · Part no. BM/T/21H-BC
Akrapovic Titanium Slip On Exhaust With Octagonal Carbon Fiber Tips - G80/G82 M3/M4
Akrapovic has achieved power gains of 10.9 HP at 6,000 rpm and torque increases of 10.3 lb/ft Torque at 6,000 rpm
Dinan · Part no. G8X-M3M4-F-GBKT
Dinan Foundation Package - G8X M3 M4
Upgrade To Dinan's Foundation Package to Save When Modifying Your G8X M3 or M4!
Dinan · Part no. G8X-M3M4-E-GBGA
G8X M3 M4 Experience Package
Upgrade To Dinan's Experience Package to Save When Modifying Your G8X M3 or M4!
MBRP · Part no. S45033CF
MBRP Stainless Steel Axleback Exhaust System - G80/G82/G83
Carbon Fiber Tips
Milltek Sport · Part no. SSXBM131X
Performance Cat Back Exhaust System
Enhance the sound of your BMW's exhaust with this exhaust system from Milltek Sport
Turner Motorsport · Part no. 008621LA03-01
G80 M3 G82 M4 Stainless Race Inspired Catback Exhaust
Performance Catback Exhaust for pure unrestricted power and sound. This exhaust takes out all of the stop gates and pairs with the S58 for an iconic driving experience.
Turner Motorsport · Part no. 008621LA01
G80 M3 G82 M4 Stainless Valved Catback Exhaust
Increase your sound, performance and aesthetic of your exhaust! Gains up to 10HP and 14FT/LBS of torque in your powerband.
XForce · Part no. ESBMG80VKCS
XForce VAREX Dual 3" Cat-Back Exhaust System - G80/G82 M3/M4 S58
Let your twin-turbo S58 sing with our VAREX Valve equipped exhaust system to suit the BMW G80 M3
Mufflers (13)
ECS · Part no. 044081LA01
Build-Your-Own Universal Vacuum-Actuated Valved Mufflers Kit
Choose between a 2.5" or 3.0" valved mufflers to complete your custom exhaust.
Valvetronic Designs · Part no. UVM63MMTSTYLEX1
Universal T-Style Valved Muffler Kit - Single Inlet / Dual Outlet - 2.5" (63mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM76MMTSTYLEX1
Universal T-Style Valved Muffler Kit - Single Inlet / Dual Outlet - 3.0" (76mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM63MMDUALOUTX1
Universal Valved Muffler Kit - Single Inlet / Dual Outlet - 2.5" (63mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM63MMDUALOUTX2
Universal Valved Muffler Kit - Single Inlet / Dual Outlet - 2.5" (63mm) - 2 Mufflers
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM76MMDUALOUTX1
Universal Valved Muffler Kit - Single Inlet / Dual Outlet - 3.0" (76mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM76MMDUALOUTX2
Universal Valved Muffler Kit - Single Inlet / Dual Outlet - 3.0" (76mm) - 2 Mufflers
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.63MM.X1
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 2.5" (63mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.63MM.X2
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 2.5" (63mm) - 2 Mufflers
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.76MM.X1
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 3.0" (76mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.76MM.X2
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 3.0" (76mm) - 2 Mufflers
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.89MM.X2
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 3.0" (76mm) - 2 Mufflers
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valvetronic Designs · Part no. UVM.89MM.X1
Universal Valved Muffler Kit - Single Inlet / Single Outlet - 3.5" (89mm) - 1 Muffler
Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button
Valve Controller (10)
Active Autowerke · Part no. 11-074G
Exhaust Valve Cable Extender - G8X
24 inch long cable for exhaust valves
ECS · Part no. 004788LA01
Remote Vacuum Exhaust Valve Control Kit
Control your exhaust valves with the click of a button! Includes a standalone vacuum pump, wiring, vacuum hose, and controllers.
MAD · Part no. MAD-144
MAD Exhaust Valve Controller Essential
Manually control muffler valve funtions with the click of a button with this plug and play kit
Retailer fitment note: For vehicles with electronic valves only
Milltek Sport · Part no. SSXBM1234
ACTIVE VALVE CONTROL
Easy change the volume of your exhaust with the push of a button!
Milltek Sport · Part no. SSXBM1192
OPF Bypass Module
For Cars with OPF/GPF Bypass Pipes
Retailer fitment note: For Vehicles With Milltek OPF Bypass Components Installed (2020+)
Valvetronic Designs · Part no. VTD.EVH
Electronic Exhaust Valve Control Kit - 1 Valve Actuator + 1 Valve To Controller Wire
Enables the control of a single electronic exhaust valve
Retailer fitment note: Please visually confirm the exhaust valve actuator installed on your vehicle prior to purchase or installation - Only compatible with systems requiring a single electric valve actuator
Valvetronic Designs · Part no. VTD.EVH.2
Electronic Exhaust Valve Control Kit - 2 Valve Actuators + 2 Valve To Controller Wires
Enables the control of two electronic exhaust valves
Retailer fitment note: Please visually confirm the exhaust valve actuator installed on your vehicle prior to purchase or installation - Only compatible with systems requiring two electric valve actuators
XForce · Part no. BMC03-SMARTBOX
XForce Smart Box Drive Mode Harness 4 Pin Plug W/ Resistor (BMW G Series)
Take full control of the positioning of your exhaust valves!
XForce · Part no. VK05-ACTUATOR
XForce Varex Toggle Switch
Control your Varex valve with the press of a button
XForce · Part no. VKSB01-ECU-MODUL
Xforce Smartbox Varex Muffler ECU Upgrade Module
Manually and automatically adjust the exhaust sound level
Mid Pipes (9)
ARM Motorsports · Part no. S58LINK
Crossover Pipe - G8X S58
Let your S58 breathe with this ARM crossover pipe!
AWE · Part no. 3820-11489
AWE Non-Resonated Performance Mid Pipes
Eliminates your stock resonator for a slightly more aggressive exhaust tone!
CTS · Part no. CTS-EXH-TP-0021
CTS Turbo Crossover Exhaust Pipe For G8X
Add in this Upgraded Crossover pipe for unrestricted flow!
Dinan · Part no. D660-0094
High Flow Exhaust Mid-Pipes
Introduces a more aggressive tone and an increase in volume over the stock system while retaining the factory muffler!
Milltek Sport · Part no. SSXBM1194
OPF Bypass Kit - Non-Resonated
Free up your restrictive OPF/GPF system
Retailer fitment note: For Vehicles With OPF (2020+)
Milltek Sport · Part no. SSXBM1193
OPF Bypass Kit - Resonated
Free up your restrictive OPF/GPF system
Retailer fitment note: For Vehicles With OPF (2020+)
Supersprint · Part no. 527713
Supersprint G8X Center Pipes - H-Pipe
100% handcrafted in Italy. Stainless steel construction. Legendary sound!
Turner Motorsport · Part no. 044868LA01
G8X M3/M4 Resonator Delete & X-Pipe
Let your S58 breathe! Eliminates the restrictive center resonator for increased sound and adds an x-pipe to increase efficiency.
Valvetronic Designs · Part no. BMWG8XCHASBRACE
G80/G82/G83 Extended Chassis Brace
Provides extra clearance, allowing for the installation of larger exhaust systems
Complete System (6)
Akrapovic · Part no. BM/T/21H
Akrapovic Titanium Exhaust Suite - G80/G82 M3/M4
Customize your Exhaust Suite to fit your needs.
Armytrix · Part no. BMG8M-QS38B
Armytrix Valvetronic Cat-Back Exhaust System - Quad Blue Coated Tips - G80/G82 M3/M4
Blue Coated Tips - Remote Valve Control, massive weight savings, and supreme quality and craftsmanship!
Armytrix · Part no. BMG8M-QS38C
Armytrix Valvetronic Cat-Back Exhaust System - Quad Chrome Tips - G80/G82 M3/M4
Chrome Tips - Remote Valve Control, massive weight savings, and supreme quality and craftsmanship!
Armytrix · Part no. BMG8M-QS38M
Armytrix Valvetronic Cat-Back Exhaust System - Quad Matte Black Tips - G80/G82 M3/M4
Matte Black Tips - Remote Valve Control, massive weight savings, and supreme quality and craftsmanship!
Genuine BMW M Performance · Part no. 18302464494KT
BMW M Performance Titanium Exhaust & Diffusor Kit - G8x M3/M4
The M Performance Rear Diffuser with Titanium exhaust perfectly rounds off the carbon all-around look
Supersprint · Part no. SSPG8X
Build-Your-Own Supersprint Performance Exhaust System
100% handcrafted in Italy. Stainless steel construction. Legendary sound!
Cutout (2)
ECS · Part no. 020923ECS02
Build-Your-Own Universal Vacuum-Actuated Exhaust Cutout Kit - Dual Cutouts
Increase HP/TQ and activate a full race exhaust with the flip of a switch, with our ECS Vacuum-Actuated Exhaust Cutouts
ECS · Part no. 020923ECS01
Build-Your-Own Universal Vacuum-Actuated Exhaust Cutout Kit - Single Cutout
Increase HP/TQ and activate a full race exhaust with the flip of a switch, with our ECS Vacuum-Actuated Exhaust Cutout
X Pipes (1)
MBRP · Part no. MBRPS4501304
MBRP 21-23 BMW M4 G82 / M3 G80 3.0L T304 Stainless Steel 3in Resonator Bypass X-Pipe
The perfect exhaust upgrade for aggressiveness but subtleness.
Guides for this decision
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