Audi B9 3.0T S4 S5 Catted Downpipe

The ARM B9 S4/S5 Catted Downpipe gives your Audi 3.0T EA839 all the power with fewer emissions. It frees up exhaust flow from the turbo while keeping fumes low, so your 3.0T spools faster with more power and sharper throttle response, especially low in the rev range — and it opens up the sound, particularly with the ARM B9 Midpipes. A tune isn't required, but pairing with one greatly increases output.

Highlights

• Increased power and torque.
• Massive 6.5" catted design.
• Faster turbo spool and an improved exhaust note.
• Fits ARM and OEM midpipes; supports hybrid turbo setups.

Construction

The OEM downpipe uses a restrictive 800-cell catalyst; the ARM downpipe replaces it with a free-flowing 200-cell catalyst. It starts with a precision CNC-machined turbo flange (matches OEM or any turbo that fits the OEM downpipe), runs a massive 6.5" catted section off the turbo, then transitions to a 3.5" Y-section with flanges precision-cut to mate to OEM B9 or ARM B9 midpipes. Comes with gaskets and hardware for the midpipe connection.

Fitment (3.0T)

Audi S4 (B9 & B9.5), Audi S5 Coupe & Sportback (B9 & B9.5).

What's included: ARM 3.0T B9 catted downpipe, midpipe gaskets and hardware.

Backed by ARM Motorsports' lifetime warranty against defects in craftsmanship and fitment.

Emissions disclaimer: This product is not legal for sale or use on pollution-controlled vehicles operated on public roads and is intended for off-road, race, or closed-course competition use only. You are responsible for compliance with all applicable emissions laws; use on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.