Grail 3-inch exhaust system suitable for BMW 4 Series M440i G22 / G23 / G26 (B58) – Exhaust Valve System

description

The GRAIL exhaust system with 3-inch diameter flaps, suitable for the BMW 4 Series. MThe 440i G22 Coupé and G23 Convertible with the B58 engine is the answer for everyone who wants more sound – no registration required, no compromises. Thanks to ECE type approval, the system is registration-free within the EU and therefore ready to drive immediately. Handcrafted in Germany from L304 stainless steel.

The B58 engine of the MThe 440i has the potential for a rich six-cylinder sound – the GRAIL exhaust system brings out exactly what BMW doesn't allow from the factory. A full, raw inline-six sound under load, without any interference with the factory exhaust valve control.

Loud but Legal: The GRAIL uses the factory BMW exhaust flap control system of your vehicle. MThe system is compatible with the 440i and behaves exactly as BMW specifies from 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 system, 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.

Highlights

• Specifically for BMW 4 Series M440i with B58 engine
• ECE type approval – registration-free within the EU
• Flap control via standard BMW control unit
• 3 inch L304 stainless steel, handcrafted in Germany
• FLOW DOWN® is an official GRAIL partner in the Ruhr area

Material

L304 stainless steel, handcrafted in Germany. Mufflers specially developed for the B58 engine in the GRAIL sound lab ensure maximum sound when the valves are open and maximum damping when they are closed – the distinctive GRAIL delta between loud and quiet.

use

The valve-controlled exhaust system replaces the entire exhaust system downstream of the pre-muffler. The valves are controlled exclusively via the factory BMW valve control system – i.e., via your vehicle's original Sport mode. No additional remote control or extra wiring harness is 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®

Since GRAIL systems have a longer delivery time due to production requirements, we offer a fair down payment model for orders including installation:

• 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 payment model works exclusively via prepayment/bank transfer. Payment via PayPal or other payment methods is not possible.

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 4er M440i G22 Coupé (B58) – ab Bj. 2020
• BMW 4 Series M440i G23 Cabrio (B58) – from 2021
• BMW 4er M440i xDrive G22 / G23 (B58)

Note: For the BMW 4 Series M440i Gran Coupé G26 as well as for the M3 G80 and M4 G82 / G83 (SFor the 58-engine) there are separate, model-specific GRAIL systems – please inquire via support.

scope of delivery

• 1x GRAIL 3-inch flap exhaust system for BMW 4 Series M440i G22 / G23 (B58)
• 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.