Grail exhaust system suitable for BMW M3 F80 (S55) – Valve system

description

The GRAIL exhaust system with flaps, suitable for the BMW M3 F80 Sedan with SThe 55-biturbo engine combines uncompromising M-Sound with full road approval. Thanks to ECE type approval, the system is registration-free within the EU and ready to drive immediately. Handmade in Germany from L304 stainless steel.

The S55-series six-cylinder engine MThe 3 F80 has enormous acoustic potential – but much of it is stifled by the factory OPF and silencer configuration. The GRAIL valve exhaust system unlocks this potential. M3. They brought out what BMW Motorsport had built into the engine: more aggressive, more voluminous. M-Six-cylinder sound with the distinctive GRAIL delta between loud and quiet.

Loud but Legal: The GRAIL uses the factory BMW exhaust flap control system of your vehicle. M3 F80 and behaves exactly like BMW M as specified by the factory. At higher engine speeds and under load, the valves open fully – then the system delivers the full GRAIL sound. Since the valves are controlled exclusively via the factory control unit, the system complies with all ECE regulations and is fully street legal.

FLOW DOWN® is an official GRAIL partner in the Ruhr area and specializes in the professional installation of exhaust systems. Installation is carried out directly at our facility in Essen – cleanly, precisely, and including a functional test of the valve control.

Important: Select the correct variant in the configurator.

The GRAIL facility for the MThe 3 F80 is offered in various versions. Depending on your vehicle, you must select the correct version in the configurator. If you select the wrong version, the system will not fit – please check carefully or contact us beforehand.

You choose from the following factors:

• Pipe diameter: 3 inches or 3.5 inches
• OPF status: with or without a gasoline particulate filter
• Tailpipes: brushed stainless steel or black

Unsure which version fits your vehicle? Send us your VIN or year of manufacture via contact form or WhatsApp – we'll check the configuration for you before you order.

3 inches or 3.5 inches – which diameter?

Both variants are technically mature and suitable for the SDesigned for 55:

• 3 inches: Classic sports exhaust diameter, slightly less aggressive in sound, ideal for daily drivers with a sporty touch.
• 3.5 inches: Maximum throughput and more voluminous sound, especially for high-performance applications M3 interesting with stage tuning

If you are unsure or planning software tuning, we will gladly advise you in advance on the optimal choice.

Highlights

• Specifically designed for BMW M3 F80 with S55-biturbo engine
• ECE type approval – registration-free within the EU
• Flap control via standard BMW control unit
• Choice of 3-inch or 3.5-inch diameter
• L304 stainless steel, handcrafted in Germany

Material

L304 stainless steel, handcrafted in Germany. CNC-machined solid stainless steel flaps switch precisely and ensure the optimal combination of backpressure reduction and sound. Specially developed in the GRAIL sound lab for the SThe 55-engine developed silencers deliver maximum sound when the flaps are open and maximum damping when the flaps are closed.

Available variants

Pipe diameter:

• 3 inch
• 3.5 inches

OPF equipment:

• With gasoline particulate filter (GPF)
• Without a gasoline particulate filter (sounds even clearer and more powerful because there is no OPF damping)

Tailpipes:

• brushed stainless steel
• black

use

The flap exhaust system replaces the entire exhaust system downstream of the pre-muffler. The flaps are controlled exclusively via the factory BMW flap control system – i.e., via the original system. M-Sport mode of your vehicle. No additional remote control or extra wiring harness required.

Professional installation by FLOW DOWN® in Essen is recommended. As an official GRAIL partner, we know the systems in detail and ensure clean installation, correct connection to the damper control, and functional testing.

GRAIL order with installation at FLOW DOWN®

For orders including installation, we offer a fair down payment model:

• Upon placing the order, you pay 50% of the investment.
• We will pay GRAIL in advance on your behalf and order the system.
• You pay the remaining amount after the system arrives at our workshop.
• Then schedule an appointment for the installation.

Important: The deposit option is only available for orders including installation and only works via prepayment/bank transfer. PayPal or other payment methods are not accepted.

Swiss suitability assessment

For customers in Switzerland: Upon request, you can receive a Swiss conformity certificate for the GRAIL exhaust system for an additional fee. If you are interested, simply contact our support team – we will clarify the details with you directly.

Suitable vehicles

• BMW M3 F80 Limousine – Bj. 2014–2018
• BMW M3 F80 Competition
• BMW M3 F80 CS

Note: For the M4 F82 Coupé and M4 F83 Cabrio (same S55-engine) as well as for M3 G80 / M4 G82 / G83 (SFor the 58-engine, there are separate, model-specific GRAIL systems. Each variant (diameter × OPF status × tailpipe color) is a separate system – please select correctly in the configurator.

scope of delivery

• 1x GRAIL exhaust system with flaps, suitable for BMW M3 F80 (in selected variant)
• Tailpipes in selected variant (stainless steel or black)
• mounting material
• ECE type approval (paper)

Information on admission

The GRAIL exhaust system has ECE type approval and is registration-free for EU vehicles. For imported vehicles with a different operating permit, please check before purchase whether registration in the vehicle documents is required. The included ECE type approval certificate should be carried in the vehicle.

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

FLOW DOWN® is an independent supplier of tuning and accessories. The use of the brand names mentioned is for guidance only and does not constitute a collaboration, licensing or approval by the respective rights holders . All trademark and name rights are held by their respective owners.