We're Open & Here For You.
Shipping 6 Days a Week.
Read our COVID-19 Update
Now Offering CURB-SIDE Pickup / FREE SHIPPING on Orders $49+ *exclusions apply
Sales & Specials

New B9 S4/S5 ECS High-Flow Catalytic Converter

The perfect way to unleash hidden horsepower in a modern turbocharged engine is to upgrade the restrictive factory catalytic converter with a smoother, higher flowing unit. This is a great way to increase performance & add a nice growl to the exhaust note. Ideal performance is achieved through expelling exhaust gasses at maximum velocity through a less-restrictive catalytic converter. We measured maximum gains of +34WHP & +41ft/lbs of torque on our Audi B9 S4 with a stock tune when equipped with an ECS Kohlefaser Luft-Technik Intake System, ECS X-Pipe, & Intercooler/Charge Pipe kit.


Unleash Hidden Horsepower

For Your Audi B9 S4/S5 3.0T

Audi B9 S4/S5 Cast Stainless Steel High Flow Catted Downpipe
Unleash up to 34 WHP with an ECS High Flow 200 Cell Catalytic Converter / Downpipe -- Includes complete install kit
Brand: ECS - Corporate Logo
ES#: 3979009
Mfg#: 025257ECS03KT1

Choose how many gift cards you would like below. You can set the denomination in your cart during checkout.

Availability:
In Stock
On SALE Save 15%
$799.95 $679.96
Free Shipping Free Shipping
Audi B9 S4/S5 3.0T Luft-Technik Intake System
Enhance your engine's performance with gains up to 16 Wheel Horsepower and 15 foot pounds of torque with our ECS Cold Air Intake
Brand: ECS - Corporate Logo
ES#: 3477816
Mfg#: 023795ECS06

Choose how many gift cards you would like below. You can set the denomination in your cart during checkout.

Availability:
On Order, ETA May 29, 2020
On SALE Save 15%
$371.95 $316.16
Free Shipping Free Shipping
Silicone Turbo Inlet Hose
Flexible silicone smooths the intake tract & hinders collapsing. The ultimate in durability!
Brand: ECS - Corporate Logo
ES#: 3420204
Mfg#: 024360ECS01

Choose how many gift cards you would like below. You can set the denomination in your cart during checkout.

Availability:
In Stock
On SALE Save 15%
$65.95 $56.06
Free Shipping Free Shipping
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
Brand: ECS - Corporate Logo
ES#: 3521607
Mfg#: 024365ECS01KT

Choose how many gift cards you would like below. You can set the denomination in your cart during checkout.

Availability:
In Stock
On SALE Save 15%
$290.95 $247.31
Free Shipping Free Shipping
Audi B9 S4 Charge Pipe Kit
Increase intake air flow with our high flow charge pipes for your ECS Tuning or OEM intercooler!
Brand: ECS - Corporate Logo
ES#: 3638868
Mfg#: 023880ECS01AKT

Choose how many gift cards you would like below. You can set the denomination in your cart during checkout.

Availability:
In Stock
On SALE Save 15%
$324.95 $276.21
Free Shipping Free Shipping

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

Terms of Use Privacy Policy ECS Tuning is part of Enthusiast Auto Holdings