Audi S4 exhaust systems

APR · Part no. CBK0012

APR Cat-Back Exhaust System - B9 S4/S5

Features TIG welded brushed T304 stainless steel construction and offers gains of 10 AWHP and 12 AWFT-LBS of torque

AWE · Part no. AWEB9S4SP

AWE SwitchPath Exhaust System - Audi B9 S4 3.0T

Comes complete with non-resonated downpipes, a precision-engineered x-pipe mid-section, and two valved muffler sections.

AWE · Part no. AWEB9S4TR

AWE Touring Edition Exhaust System - Audi B9 S4 3.0T

Removes the factory valving and replaces it with AWE’s 180 Technology® drone-cancelling resonators and resonated downpipes.

AWE · Part no. AWEB9S4TK

AWE Track Edition Exhaust System - Audi B9 S4 3.0T

Equipped with the same precision-engineering as its Touring Edition counterpart, minus the resonators up front and 180 Technology® resonators in the rear.

Doorbusters · Part no. 026018ECSDBKT

Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System - With Luft-Technik Intake System

Improve the sound and performance of your vehicle with a valved catback and a FREE Luft-Technik Intake System

ECS · Part no. 026018ECS

Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System

ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience

ECS · Part no. 008553ECS12-01

ECS Tuning Exhaust Resonator Delete Section

Change out your ECS Tuning B8/8.5 S4/S5 or B9 A4/S4 Valved Exhaust from resonated to non-resonated!

Enthusiast Bundles · Part no. 026018ECSEBKT

Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System & Luft-Technik Intake System

Improve the sound and performance of your vehicle with a valved catback & Luft-Technik Intake System

Integrated Engineering · Part no. IEEXCK5

IE Cat-Back Exhaust System - B9/B9.5 S4

Delivers a truly aggressive exhaust note without any annoying drone or rasp

Milltek Sport · Part no. SSXAU701

B9 S4/S5 Cat-Back Exhaust System - Non-Resonated (Louder)

2.50" stainless steel with quad GT-100 cerakote black tips

Retailer fitment note: Fits models with factory rear sports differential

Milltek Sport · Part no. B9NONRESONATED

Cat-Back Exhaust - Non Resonated

2.50" stainless steel with your choice of tip style

Milltek Sport · Part no. B9RESONATED

Cat-Back Exhaust - Resonated

2.50" stainless steel with your choice of tip style

Milltek Sport · Part no. SSXAU657

Cat-Back Exhaust System - Non-Resonated (Louder)

2.50" stainless steel with quad GT-90 titanium tips

Retailer fitment note: Fits models without factory rear sports differential

Milltek Sport · Part no. SSXAU695

Cat-Back Exhaust System - Resonated With Exhaust Valves

2.50" stainless steel with quad GT-100 Cerakote black tips

Retailer fitment note: Fits models with factory rear sports differential For vehicles with a sport differential and without brace bars

Milltek Sport · Part no. SSXAU649

Cat-Back Exhaust System - Resonated With Exhaust Valves

2.50" stainless steel with quad Cerakote black velvet oval tips

Retailer fitment note: Fits models without factory rear sports differential For vehicles without a sport differential

Milltek Sport · Part no. SSXAU641

Cat-Back Exhaust System - Resonated With Exhaust Valves

2.50" stainless steel with quad GT-100 Cerakote black tips

Retailer fitment note: Fits models without factory rear sports differential For vehicles without a sport differential

Supersprint · Part no. 777512KT

Supersprint Cat-Back Exhaust System - Non-Resonated

Stainless steel non-resonated cat-back exhaust system with quad round, polished tips - Includes secondary cat delete downpipes

Supersprint · Part no. 777532KT

Supersprint Cat-Back Exhaust System - Resonated

Stainless steel non-resonated cat-back exhaust system with quad round, polished tips - Includes downpipes with high flow secondary cats

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

034Motorsport · Part no. 034-105-7060

Res-X Front Resonator Delete

Unleash a throaty growl under hard acceleration!

CTS · Part no. CTS-EXH-TP-0019

CTS Resonator Delete Kit

Get all the benefits of using this resonator delete without the high price tag.

ECS · Part no. 024365ECS01KT

B9 S4 3.0T Center X-Pipe

Sound great and save weight! Eliminate the center resonator on your OE system for a more aggressive exhaust note

Genuine Volkswagen Audi · Part no. 8W0253409G

Exhaust Mid pipe Muffler

Mufflered midpipe that connects the downpipe to the rear mufflers

Integrated Engineering · Part no. IEEXCK4

IE Midpipe Exhaust Upgrade

Aggressive sound, quality finish, reliable operation, straightforward install, and affordable fun.

Verstarkt Performance Systems · Part no. B9PMD2017

VPS Pre Muffler Delete Kit

Unleash the sound your 3.0T was meant to have!

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

034Motorsport · Part no. 034-105-7051

Res-X Resonator Delete Pipe And X-Pipe

Transform your exhaust note

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.