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Audi B6 A4 Quattro 1.8T

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Audi B6 A4 Quattro 1.8T Performance Exhaust Parts

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Audi B6 A4 1.8T Exhaust System - Cat Back

ES#4505667 - 016837ECS - Audi B6 A4 1.8T Exhaust System - Cat Back - Downpipe & Catback along with your choice of exhaust tips and more! - ECS - Audi

Downpipe & Catback along with your choice of exhaust tips and more! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
For 5 and 6 speed manual transmissions only

Brand:
ECS - Corporate Logo
ES#:
4505667
Mfg#:
016837ECS
In Stock
ON SALE!
Starting at $899.99 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Remote Vacuum Exhaust Valve Control Kit

ES#4883843 - 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. - ECS - Audi BMW Volkswagen Mercedes Benz MINI

Control your exhaust valves with the click of a button! Includes a standalone vacuum pump, wiring, vacuum hose, and controllers. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
10X Entries For Our Spin To Win Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4883843
Mfg#:
004788LA01
In Stock
ON SALE! SAVE 10%
$99.99

This product was last offered at the strikethrough price on
05-02-2026

$89.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Build-Your-Own Universal Vacuum-Actuated Valved Mufflers Kit

ES#4715424 - 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. - ECS - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Choose between a 2.5" or 3.0" valved mufflers to complete your custom exhaust. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4715424
Mfg#:
044081LA01
In Stock
ON SALE!
Starting at $57.57 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Exhaust Manifold Installation Kit

ES#2575944 - N0444115HWKT-1 - Exhaust Manifold Installation Kit - Includes the necessary hardware and gasket to install the manifold - Assembled By ECS - Audi Volkswagen

Includes the necessary hardware and gasket to install the manifold affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2575944
Mfg#:
N0444115HWKT-1
In Stock
ON SALE! SAVE 15%
$158.99

This product was last offered at the strikethrough price on
05-02-2026

$134.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

3" High Flow Catalytic Converter

ES#2864552 - 034-105-4021 - 3" High Flow Catalytic Converter - complete drop-in upgrade will bolt up to stock/Stock Fit Turbo - 034Motorsport - Audi

complete drop-in upgrade will bolt up to stock/Stock Fit Turbo affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
2864552
Mfg#:
034-105-4021
Ships in 3 Business Days
$474.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Self-Locking Nut - Priced Each

ES#2588753 - N90369001 - Self-Locking Nut - Priced Each - Install new hardware with your new parts. M10x1.5 - Rein - Audi BMW Volkswagen

Install new hardware with your new parts. M10x1.5 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Secures the catalytic converter to the turbocharger

Brand:
Rein - Corporate Logo
ES#:
2588753
Mfg#:
N90369001
In Stock
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

CTS Turbo B6 A4 High-flow Cat Pipe

ES#4043061 - CTSEXHTP0002B6CA - CTS Turbo B6 A4 High-flow Cat Pipe - Seamlessly fits in place of your restrictive stock cat - Features 3 stainless steel piping, smooth mandrel bends, and two 02 sensor bungs - CTS - Audi

Seamlessly fits in place of your restrictive stock cat - Features 3″ stainless steel piping, smooth mandrel bends, and two 02 sensor bungs affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
CTS - Corporate Logo
ES#:
4043061
Mfg#:
CTSEXHTP0002B6CA
Ships in 7 Business Days
$249.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Performance Stainless 2.5" Downpipe

ES#3175267 - 251125 - Performance Stainless 2.5" Downpipe - High flow, stainless downpipe kit to be used with 2.5" aftermarket exhaust - Techtonics Tuning - Audi

High flow, stainless downpipe kit to be used with 2.5" aftermarket exhaust affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits quattro 5-speed transmission models only - To be used with 2.5" aftermarket exhaust system

Brand:
Techtonics Tuning - Corporate Logo
ES#:
3175267
Mfg#:
251125
Ships on Jun 25, 2026
$286.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated

ES#2827275 - SSXAU089 - Cat-Back Exhaust System - Resonated - 2.5" stainless steel with dual 100mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual 100mm polished tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits 5 speed manual only

Brand:
Milltek Sport - Corporate Logo
ES#:
2827275
Mfg#:
SSXAU089
Ships in 3 Business Days
$1875.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated

ES#2827276 - SSXAU090 - Cat-Back Exhaust System - Resonated - 2.5" stainless steel with dual 100mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual 100mm polished tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits 6 speed manual only

Brand:
Milltek Sport - Corporate Logo
ES#:
2827276
Mfg#:
SSXAU090
Ships in 3 Business Days
$1875.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust - Resonated

ES#2827253 - SSXAU034 - Cat-Back Exhaust - Resonated - 2.5" stainless steel and 90mm tips - Milltek Sport - Audi

2.5" stainless steel and 90mm tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For 6 speed manual transmission Avant models only,

Brand:
Milltek Sport - Corporate Logo
ES#:
2827253
Mfg#:
SSXAU034
Ships in 3 Business Days
$1856.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated

ES#2827252 - SSXAU033 - Cat-Back Exhaust System - Resonated - 2.5" stainless steel with dual 90mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual 90mm polished tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits 5 speed manual only

Brand:
Milltek Sport - Corporate Logo
ES#:
2827252
Mfg#:
SSXAU033
Ships in 3 Business Days
$1856.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Catalytic Converter Installation Kit

ES#3028723 - 8D0253115KT3 - Catalytic Converter Installation Kit - Includes the necessary hardware and gaskets to install the catalytic converter - Assembled By ECS - Audi Volkswagen

Includes the necessary hardware and gaskets to install the catalytic converter affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
3028723
Mfg#:
8D0253115KT3
In Stock
ON SALE! SAVE 16%
$59.99

This product was last offered at the strikethrough price on
05-02-2026

$50.47 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Longitudinal High Flow Exhaust Manifold

ES#2864553 - 034-105-9000 - Longitudinal High Flow Exhaust Manifold - Stock fit high flow manifold - 034Motorsport - Audi

Stock fit high flow manifold affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
2864553
Mfg#:
034-105-9000
Ships on Jun 22, 2026
Auto Notify
$345.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Universal Dual Exhaust Tip - Dual 3" - Pair

ES#2974340 - 35229 - Universal Dual Exhaust Tip - Dual 3" - Pair - Double wall stainless steel. Single 2.25" inlet, Dual 3" outlet. - Magnaflow - Audi Volkswagen

Double wall stainless steel. Single 2.25" inlet, Dual 3" outlet. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Magnaflow - Corporate Logo
ES#:
2974340
Mfg#:
35229
Ships in 7 Business Days
$332.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Non-Resonated

ES#2827429 - SSXAU305 - Cat-Back Exhaust System - Non-Resonated - 2.5" stainless steel with dual 100mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual 100mm polished tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits 5 speed manual only

Brand:
Milltek Sport - Corporate Logo
ES#:
2827429
Mfg#:
SSXAU305
Ships in 3 Business Days
$1657.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Exhaust Parts

Performance exhaust systems increase flows to improve throttle response and add power. Designed to reduce back pressure, our large selection of performance exhaust parts and performance exhaust systems is made from premium materials like stainless steel. Many are TIG welded and polished to make them as attractive as they are functional.

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

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