Grail exhaust system suitable for Audi RS3 Sportback 8Y (DAZA) – valve system

The 5-cylinder engine deserves the sound that Audi withholds from it as standard.

The Audi RS3 8Y Sportback is acoustically in a class of its own – the DAZA 2.5 TFSI with 400 hp and its distinctive 5-cylinder firing order is one of the most emotionally engaging engines in the performance world. However, what Audi holds back with the OPF (Otto Particulate Filter) and factory-installed silencer is enormous. The GRAIL flap exhaust system frees the 5-cylinder from its constraints and lets it perform as it should: a full, powerful 5-cylinder bass with the typical full-throttle character, crisp backfires during load changes, and a subtle sound in Comfort mode.

Completely made of L304 stainless steel, handcrafted in Germany. ECE type approval – therefore registration-free in all EU vehicles with standard approval. Ready to drive immediately after installation.

Two flaps in a row – the maximum sound delta

GRAIL uses a technical solution for the RS3 8Y that hardly any other supplier on the market offers: Two flaps are installed one behind the other in a row.This offers a decisive advantage over standard systems with only one flap – the absolute maximum between quiet and loud.

• Flaps closed: Both flaps consistently block the exhaust flow – the system cleanly complies with all prescribed noise levels. You can drive through any 30 km/h zone, any town, any residential area without stress. Full ECE compliance.
• Flaps open: Both flaps release the full exhaust flow – uncompromisingly loud, a full 5-cylinder sound without any restraint. Exactly what Audi delivers to the DAZA from the factory.

The result: a significantly larger sound delta than with comparable systems with only one flap – more brutal in Sport mode, more subtle in Cruise mode.

Flap control – via the Audi driving modes

Both flaps are controlled via the factory-installed Audi flap control system of your RS3. No remote control, no additional module, no modification to the MMI.

• In Dynamic or RS mode: Both flaps open – full GRAIL sound
• In Comfort or Efficiency mode: Both flaps closed – ECE-compliant and discreet

Configuration in the configurator

Before ordering, you choose:

• Model year: Pre-facelift or facelift
• Downpipe connection: On a standard or HJS downpipe
• Tailpipe variant: With funnel-shaped tailpipes (black) or without tailpipes

If you are unsure about the model year, simply send us the VIN via WhatsApp or contact form – we will check it before ordering.

Tailpipe variants – important to know

GRAIL offers two exhaust pipe options for the RS3 8Y, which differ fundamentally:

Option 1: Funnel-shaped tailpipes in black (recommended)

The black funnel-shaped tailpipes are precisely integrated into the factory rear aprons of the RS3 8Y. They ensure that the exhaust gases are safely and controllably expelled through the rear bumper – exactly as Audi intended with the OEM system. Visually discreetly integrated, technically a clean solution.

Option 2: Without tailpipes

With this option, the exhaust pipes end in front of the rear panels – the exhaust gases are not routed through the factory-installed tailpipe outlets. Important NOTE: This variant can cause exhaust fumes to accumulate under the vehicle. This can lead to damage to the rear bumper, paintwork, diffuser, or other components in the rear area.

Disclaimer: We strongly recommend the version with our funnel-shaped tailpipes to ensure controlled and safe exhaust gas discharge. Neither GRAIL nor FLOW DOWN® accepts liability for damage resulting from choosing the version without tailpipes. The buyer bears full responsibility.

Downpipe connection

• A series: Standard choice for RS3 8Y without downpipe modification. Direct connection to the factory downpipe.
• To HJS: For drivers with an installed HJS downpipe (typical for Stage 2 / Stage 3 setups). The GRAIL is manufactured with a compatible interface for HJS.

Material & workmanship

L304 stainless steel throughout, CNC-machined components. The silencers and both valves were specially tuned in the GRAIL sound lab for the DAZA 5-cylinder engine of the RS3 8Y – taking into account the characteristic firing order and the typical 5-cylinder sound spectrum. Flow-optimized pipe routing minimizes exhaust backpressure when the valves are open. Both valves are made of solid stainless steel, offering precise switching and long-lasting suitability for everyday use.

Highlights

• Specifically designed for Audi RS3 Sportback 8Y with DAZA 5-cylinder engine
• Two flaps in a row – maximum sound delta between loud and quiet
• ECE type approval – registration-free within the EU
• Flap control via standard Audi driving modes
• L304 stainless steel, handcrafted in Germany

Order with installation from FLOW DOWN®

FLOW DOWN® is an official GRAIL partner in the Ruhr area. When you order with installation, you'll receive our fair deposit payment model:

• 50% deposit upon order placement – we will then order the system from GRAIL
• As soon as the system arrives at our workshop, we will arrange an installation date with you.
• You only pay the remaining amount after the installation has been completed – not before.

Important: The deposit payment option applies exclusively to bookings including installation and is only available via prepayment/bank transfer. PayPal or other payment methods are not accepted for this service.

Swiss suitability assessment

Upon request, you can receive a Swiss suitability assessment for the GRAIL system for an additional fee. If interested, simply contact support.

Suitable vehicles

• Audi RS3 Sportback 8Y Vor-Facelift (DAZA 2.5 TFSI)
• Audi RS3 Sportback 8Y Facelift (DAZA 2.5 TFSI)
• Audi RS3 Sportback 8Y Performance Edition

Not suitable for: Audi RS3 Sedan 8Y (different rear geometry, separate system available in the shop), Audi S3 Sportback 8Y (different engine and exhaust system), Audi RS3 8V (predecessor). Separate GRAIL systems are available for each of these models.

scope of delivery

• GRAIL exhaust system with flaps, suitable for Audi RS3 Sportback 8Y (in your chosen variant)
• Two integrated flaps in a row
• If you choose to have tailpipes: Funnel-shaped tailpipes in black
• mounting material
• ECE type approval as proof for the vehicle

Information on admission

Registration-free thanks to ECE type approval – applies to all EU vehicles with standard registration. For imported vehicles with a different operating permit, please check registration requirements before ordering. The ECE type approval certificate should be kept in the vehicle's glove compartment.

All brands, model designations and manufacturers named in this shop, such as AUDI, BMW, Hyundai, Kia, Toyota, VW, Tesla, serve solely to describe the compatibility of our products. They have no connection with the respective brand owners, and unless expressly stated otherwise these are not original parts from those manufacturers.

FLOW DOWN® is an independent supplier of tuning and accessory parts. The brand names are used purely for orientation and imply no cooperation, licensing or approval by the respective rights holders. All trademark and naming rights remain with their respective owners.