Audi B9 3.0T S4 S5 Downpipe

The ARM B9 S4/S5 Downpipe is one of the best upgrades for the Audi 3.0T EA839 engine. The OEM downpipe uses a large 800-cell catalyst that chokes airflow out of the engine — the ARM unit replaces that restriction so the turbo spools faster, throttle response sharpens and power and torque climb. It also opens up the 3.0T's sound, especially paired with the ARM B9 Midpipes. A tune isn't required, but pairing with one maximises the gains.

Highlights

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

Construction

• Precision CNC-machined turbo flange matching the OEM (or any turbo that fits the OEM downpipe).
• Massive 6.5" section off the turbo transitioning to a Y-section that starts at 3.5" and steps down to meet the OEM midpipe flanges.
• Midpipe flanges precision-cut to match OEM B9 or ARM B9 midpipes.

Fitment (3.0T)

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

What's included: ARM 3.0T B9 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.