Grail exhaust system suitable for Audi TTS Roadster 8S / FV – valved exhaust system

Open-top driving with the sound the 2.0 TFSI deserves

The Audi TTS Roadster 8S (internally also FV) is the open version of the sporty TTS - with 286 to 310 hp from the 2.0 TFSI, all-wheel drive and a fabric roof. If you drive with the roof down, you want to experience the engine; that is the whole point. Yet Audi keeps the TTS noticeably quiet from the factory. With the GRAIL valved exhaust system you get back the sound that suits open-top driving. With the roof down the system becomes the real reason you bought it - a sporty TFSI sound straight from the rear, unfiltered by a solid roof.

Hand-made in Germany from L304 stainless steel, with ECE type approval. So no registration is required on any EU vehicle with standard type approval.

Open-air sound with the roof down

With the roof down, the effect of the GRAIL system is noticeably more intense than in a closed coupé. The sound waves reach the driver's ears straight from the rear, without being filtered by a roof. In Dynamic mode with the roof down you get the unfiltered 2.0 TFSI character with pops on the overrun - exactly what a roadster should sound like. With the roof up the noise level inside stays comfortable, because the valves follow the driving modes.

With or without a particulate filter - both versions available

The system is available for Roadster models with a petrol particulate filter and for models without one. In the configurator you choose the version that matches your car:

• With particulate filter:For TTS Roadster models with a factory petrol particulate filter (introduced gradually from around 2018). The filter stays integrated in the system - full ECE compliance, no registration required.
• Without particulate filter:For older TTS Roadster models without a petrol particulate filter. Even clearer and stronger in sound, because nothing mutes the exhaust flow.

Two valves in series - why that makes sense on the roadster

In the TTS system GRAIL fitstwo valves one behind the other, in series. That matters particularly on the roadster, because open bodies react more sensitively in acoustic terms:

• Valves closed:Both valves block the flow completely. You can drive through residential areas with the roof down without the neighbourhood noticing what you drive. Fully ECE-compliant and suited to everyday use.
• Valves open:Both valves open the exhaust flow. With the roof down the effect is a level more intense than in a closed coupé - pure TFSI character straight from the rear.

Valve control via the Audi driving modes

Both valves are controlled by the factory Audi valve control of your TTS Roadster. You operate them as usual via the MMI:

• Dynamic mode: both valves open - the full GRAIL sound
• Comfort or Efficiency: both valves closed - restrained and ECE-compliant

Roadster or Cabrio - both mean the same thing

Audi officially calls the open version of the TTS the "Roadster". In everyday use people often say "Cabrio" as well. Both terms mean the same car. This GRAIL system fits the open body only - you will find the version for the closed coupé as a separate product in the shop.

Selection in the configurator

Before ordering you choose the following options:

• Particulate filter status:With or without a petrol particulate filter
• Downpipe connection:To the standard downpipe or an HJS downpipe
• Exhaust tip colour:Brushed stainless steel or black

Not sure about the particulate filter or the downpipe connection? Send us the VIN via WhatsApp or the contact form - we will check before you order.

Downpipe connection - standard or HJS

• To the standard downpipe:The standard choice for a TTS Roadster without a modified downpipe. The GRAIL system connects directly to the factory downpipe.
• To an HJS downpipe:For drivers with an HJS downpipe fitted (common on Stage 2 or Stage 3 set-ups). The GRAIL system is made with the matching interface for HJS.

Exhaust tips - quad round, 100 mm

The system comes with the classic quad-tip look: four round 100 mm tips, sporty and bold at the rear. That gives the Roadster an unmistakably aftermarket appearance - fitting for an open-top car:

• Brushed stainless steel:Sporty and elegant, with a refined look at the rear - especially good on light paint colours
• Black:A matt black quad-tip look - understated yet bold, ideal in combination with a dark roof

Material and workmanship

Made entirely from L304 stainless steel, with CNC-machined components. The silencers and both valves are tuned in the GRAIL sound lab specifically for the 2.0 TFSI of the TTS - taking into account the roadster's particular sound radiation with the roof down. Flow-optimised pipe routing minimises back pressure when the valves are open. Both valves are machined from solid stainless steel, switch precisely and are designed for many years of use.

Highlights

• Specifically suitable for Audi TTS Roadster 8S / FV
• Available with or without a particulate filter
• Two valves in series - a wide acoustic range
• ECE type approval - no registration required within the EU
• Quad round 100 mm in stainless steel or black

Ordering with fitting at FLOW DOWN®

FLOW DOWN® is an official GRAIL partner in the Ruhr region. When you order with fitting, you get our fair deposit model:

• 50 % deposit when you place the order - we then order the system from GRAIL
• As soon as the system arrives at our workshop, we arrange the fitting appointment with you
• You pay the balance only after fitting has been completed - not before

Important:The deposit model applies only when fitting is booked and is possible by advance payment / bank transfer only. PayPal and other payment methods are not accepted for this.

Swiss suitability certificate

On request you can obtain a Swiss suitability certificate for the GRAIL system for a surcharge. If you are interested, simply contact our support team.

Compatible vehicles

• Audi TTS Roadster 8S (with particulate filter, from around 2018)
• Audi TTS Roadster 8S (without particulate filter, up to around 2018)
• Audi TTS Cabriolet 8S / FV (the colloquial name for the Roadster)

Not suitable for: Audi TTS Coupé 8S (different body, with its own system in the shop), Audi TT RS Roadster 8S (five-cylinder engine and a completely different exhaust system), Audi TT 8S Roadster (base model, different engine). There are separate GRAIL systems for each of these models.

Scope of delivery

• GRAIL valved exhaust system suitable for Audi TTS Roadster 8S / FV (in deiner gewählten Variante)
• Two integrated valves in series
• 4× round 100 mm exhaust tips in brushed stainless steel or black (as selected)
• Mounting hardware
• ECE type approval as documentation to keep in the car

Road-legality notes

No registration required thanks to ECE type approval - valid for all EU vehicles with standard type approval. On cars with a particulate filter, the factory filter stays integrated in the system and ensures full ECE compliance. For imported cars with a different operating permit, please check the registration requirements before ordering.

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.