SAY IT LOUDLY

Your S4 should sound as mean as it looks and drives. Stock is too quiet and others add volume with rasp and drone. iE Catbacks bring a deep, aggressive roar under throttle, while DroneTrap™ helps keep the cabin comfortable. Give your Audi a voice.

VALVED OR ROWDY

One amazing sound. Three ways to make it yours.

LOW-KEY WHEN YOU WANT IT

LOW-KEY WHEN YOU WANT IT

Some drives you'd rather keep things low-key. iE valved exhaust adds stock and app-controlled valves that get loud when you want it, or close them to to keep it subdued.. it's your call.

ALWAYS ON

ALWAYS ON

For drivers who want the roar every mile, the non-valved catback delivers a deep, aggressive note. DroneTrap™ helps keep rasp and cabin drone in check.

MORE SOUND, MORE FLOW

MORE SOUND, MORE FLOW

Take your valved or non-valved iE Catback further with optional Midpipes. Replace two factory resonators with 12 feet of piping for an even bigger sound and improved exhaust flow.

CONTROLLED CHAOS

DroneTrap™ is our proprietary resonator, tuned specifically for the B9 S4 V6 to target frequencies that cause annoying cabin drone, rasp, and vibrations. Keep the roar, trap everything else.

HIT THE GYM

Look stronger, bigger, and meaner with over-sized quad slash-cut motorsport tips. No cutting or melted bumpers here, these aggressive tips fill the factory exhaust cutouts with a perfect high-end fit.

HIT THE GYM

HEAR IT IN ACTION

MMI OR APP - YOUR CALL

No garage-door-style remote to dig out or lose. Control your iE Valved Catback just like stock from your MMI. iE PRO pr APEX Tune Suite users can take manual control with the POWERLink app on your phone or through CarPlay at anytime.

MMI OR APP - YOUR CALL

BUILT RIGHT

Unlike cheap, thin-walled systems, iE Catbacks fit precisely and are built to handle heat and vibration. T304L stainless, hand TIG welds, boxed hangers, bridged piping, reinforced stamped resonators, and lap-joint connections help keep the system tight and sealed. Drive it hard.

BUILT RIGHT

BOLT IT ON

You don't need a lift or a welder. The iE Valved Catback is a true bolt-on that lines up with your factory hangers and mounts, using basic hand tools. Bolt it on in your garage then let it rip.

BOLT IT ON

Tech Specs

Specification Details
Material
  • Stainless steel
  • T304L
Resonator
  • iE DroneTrap™
  • B9 S4 V6T specific design
Tip Design
  • 90MM Single wall slash-cut
  • Quad tips (2 per side)
Diameter
  • Dual 2.5" Piping
  • High-flow for any power goal
Construction
  • TIG welded
  • Mandrel bent
Valve Control
  • Factory control / MMI or iE POWERlink App with any PRO or APEX Tune Suite
  • Requires valved exhaust option*
Hanger design
  • Reinforced boxed design
  • -
Downpipe Compatability
  • Stock or aftermarket
  • -
Midpipe Compatability
  • Stock or iE Midpipes
  • -

INSTALL GUIDE

Difficulty

photosphotosphotosModerate

Time

photos Around 3-4 hours

Download Pdf

Enjoy a quick and hassle-free DIY install. Basic hand tools are all that is needed for this one. You got this.

WE GOT YOU

Have questions about tuning your Audi with iE? Our in-house team of Mod Gurus are serious motorheads with big brains and the know-how to steer you right.

Let’s Connect

COMPATIBILITY

YEAR MAKE MODEL ENGINE DRIVE
2017-2024 Audi S4 3.0T Quattro
img FITMENT NOTES

MMI or POWERlink app exhaust valve control requires iE Valved Catback option

FAQs

Why choose iE B9 S4 exhaust?

+ Aggressive deep roar under throttle
+ DroneTrap™ smooths harsh annoyances 
+ No highway drone or cabin fatigue
+ Built strong with boxed hangers
+ True bolt-on with no cutting or welding

Will a Catback give my Audi S4 Drone?

Not with iE. Our Catbacks use proprietary DroneTrap™ technology to target and cancel the exhaust frequencies that cause interior drone. This keeps the exhaust aggressive under throttle while remaining comfortable during steady highway cruising.

Is stainless steel the best option for my B9 S4?

Yes. iE Catback systems use premium 304 stainless steel for it's excellent corrosion resistance and long-term durability. Combined with reinforced boxed hangers and secure lap-joint connections, this construction keeps the exhaust strong, sealed, and reliable in any climate.

How difficult is it to install a catback exhaust on a B9 S4?

With iE, installation is straightforward and DIY-friendly. These catbacks are a true bolt-on system that requires no cutting or welding and installs with basic hand tools using factory mounting locations. Most owners will have no trouble performing the installation in their own garage, however an auto-lift will make life much easier.

Do I need a remote for the iE valved Catback?

No, and that's exactly what drivers asked for. Other valved systems ship a remote that works like a garage-door opener. iE valves are controlled right from the factory MMI controls or through our POWERlink app with an iE PRO Tune Suite.

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FROM THE SMALLEST DESIGN DETAILS TO CUSTOMER CARE, WE OBSESS OVER EVERY PART OF YOUR EXPERIENCE.

Not currently legal for road use in California

Because this part doesn't currently comply with California emissions laws, we can't sell or ship it to California addresses. Everywhere else? Full send.

California Prop 65 warning: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.