ARM Motorsport Audi B9/9.5 S4 S5 Midpipes
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The B9 3.0T is one of Audi's best modern performance platforms.
Unfortunately, Audi also did what Audi does best: they built an excellent drivetrain and then spent millions of dollars making sure you can't hear any of it.
The ARM Motorsports 3" Midpipes fix that.
If you're looking for one modification that transforms the personality of the car without turning it into an obnoxious highway drone machine, this is it.
The Exhaust Upgrade Audi Should Have Built
Most aftermarket midpipes use tubing sizes that are only marginally larger than stock.
ARM took a different approach.
These midpipes utilize a full 3" design through the vast majority of the system, making them approximately 30% larger than the factory piping and significantly larger than many competing options.
The result?
More volume.
More character.
More turbocharged V6 goodness.
Without making the car sound like a clapped-out Facebook Marketplace project.
Cold starts have more authority. Acceleration becomes more aggressive. The car finally sounds like the performance sedan Audi promised in the brochure.
More Sound. More Flow. More Fun.
Let's be honest.
Nobody installs midpipes because they enjoy looking at stainless steel tubing underneath the car.
You install them because the factory exhaust is too quiet.
The ARM 3" Midpipes wake the car up without completely changing its personality. The tone becomes deeper, richer, and significantly more engaging while maintaining excellent daily-driver manners.
The added flow also helps reduce exhaust restriction, improving efficiency and supporting power gains across the rev range.
It's one of those modifications that makes you find excuses to drive the car.
No Cutting. No Drama.
One of the best parts of the ARM system is how straightforward it is.
No cutting.
No trimming.
No fabrication.
No "well, it almost fits."
Everything bolts directly into place using factory mounting locations and OE-style flex sections for proper fitment and longevity.
Installation typically takes 60-90 minutes, making it one of the highest smile-per-dollar modifications available for the B9 platform.
Features
- Full 3" midpipe design
- Approximately 30% larger than factory piping
- Deeper, more aggressive exhaust note
- Increased exhaust flow
- Improved throttle response
- OE-style flex sections
- Fully reversible bolt-on installation
- No cutting or trimming required
- 60-90 minute install time
ORT Notes
If you've been driving your B9 for a while and feel like the car is a little too civilized, start here.
The ARM Midpipes don't reinvent the platform. They simply remove some of the factory restraints and let the EA839 sound like the turbocharged performance engine it was always meant to be.
One drive is usually all it takes to wonder why Audi didn't build them this way from the factory.
