Turbosmart 15-21 Mercedes-Benz C63 4.0L (M177) BOV Kompact EM DualPort VR29

Two Electronically Managed Blow Off Valves That Drop Straight Into the M177 Without a Single Tune Change

The Turbosmart TS-0223-1055 Kompact EM DualPort VR29 is a direct-fit blow off valve kit for the 2015-2021 Mercedes-AMG C63 and C63 S. The M177 4.0L twin-turbo V8 runs one turbocharger per cylinder bank with the turbos mounted in the engine vee, and the TS-0223-1055 replaces both factory diverter valves with plug-and-play Kompact EM units. Each valve bolts to the compressor cover housing using three of the six included 5mm Allen bolts and wires directly to the OEM solenoid connector, so the factory ECU continues to manage valve timing with no tune modification required.

The Boost-Balance Valve Technology integrated into every TS-0223-1055 unit uses a patented pressure control system to equalize boost pressure across the valve seat before opening, eliminating the pressure spikes and compressor surge that cause boost drop and intercooler heat soak on back-to-back hard pulls. The dual port design vents a portion of charge air to atmosphere for an audible BOV sound while simultaneously recirculating the remainder back into the intake, giving C63 owners the signature tone without sacrificing turbo spool on the next gear. Billet construction and high-temperature O-rings make the TS-0223-1055 a long-term upgrade built for sustained track use and back-road abuse alike.

Key Features

• Direct replacement for both OEM diverter valves on the 2015-2021 Mercedes-AMG C63 and C63 S M177 4.0L twin-turbo V8
• Plug-and-play integration with the factory ECU solenoid connector, no tune required
• Dual port design: vents to atmosphere for sound while simultaneously recirculating charge air
• Boost-Balance Valve Technology equalizes pressure across the valve seat before opening to eliminate compressor surge
• Patented integrated pressure control: USA Patent 10,781,745 and AUS Patent 2018253619
• Billet aluminum construction with high-temperature O-rings rated for sustained boost and heat
• Mounts on the compressor cover housing in the engine vee, one unit per turbo, two per kit
• Three 5mm Allen bolts per valve using three of the six included Allen bolts
• Compatible with stock boost levels and tuned applications
• Turbosmart limited warranty: 1 year from date of purchase

Fitment

Specifications

What's Included

• 2x Turbosmart Kompact EM DualPort VR29 blow off valves
• 6x 5mm Allen bolts (3 per valve)
• 1x 100mm cable tie
• 1x Turbosmart sticker
• 1x Instruction card

Frequently Asked Questions

What does the Turbosmart TS-0223-1055 do differently than the factory diverter valve on the C63?

The OEM diverter valve on the M177 is designed for reliability and emissions compliance, not performance. Under hard driving it can allow compressor surge when the throttle closes abruptly, causing audible chatter, boost pressure spikes, and premature wear on the turbocharger. The TS-0223-1055 uses Turbosmart's Boost-Balance Valve Technology to equalize pressure across the valve seat before opening, which eliminates surge completely. The dual port design also gives you an audible venting sound the stock valve cannot produce.

Does the TS-0223-1055 require a tune or ECU modification to install?

No. The TS-0223-1055 is a plug-and-play replacement. Each valve uses the factory OEM solenoid connector, so the stock ECU continues to control valve timing exactly as before. No tune, no flash, and no additional wiring are required. The valves are compatible with stock boost levels and aftermarket tunes alike.

How many valves come in the TS-0223-1055 kit?

Two. The M177 4.0L twin-turbo V8 in the C63 runs one turbocharger per cylinder bank with both turbos positioned in the engine vee. Each turbo has its own diverter valve, so the TS-0223-1055 includes two Kompact EM DualPort VR29 units to replace both OEM valves in a single purchase.

What is dual port operation and how does it work on the TS-0223-1055?

Dual port means the valve simultaneously vents a portion of charge air to atmosphere while recirculating the rest back into the intake tract. This gives you the sharp audible BOV sound on throttle lift without fully dumping all the compressed air, which means your turbo spools faster on the next application of boost compared to a full vent-to-atmosphere-only setup. It is the best of both worlds for street and track driving.

What is Boost-Balance Valve Technology and why does it matter for the C63?

Boost-Balance Valve Technology is Turbosmart's patented system for equalizing boost pressure on both sides of the valve seat before the valve opens. On a standard BOV, there is a pressure differential across the valve that causes it to slam open under high boost, creating a pressure wave that can shock the turbo and cause a momentary boost drop. The Boost-Balance system bleeds that differential off smoothly before opening, which protects the turbo and keeps boost delivery consistent run after run. This is particularly valuable on the M177 which is a highly stressed factory twin-turbo setup.

Where exactly do the TS-0223-1055 valves mount on the M177 engine?

Each valve mounts directly to the compressor cover housing on its respective turbocharger. The M177 turbos sit in the engine vee between the two cylinder banks, so both valves install in that same central location. You remove the six OEM Torx bolts per valve, position the TS-0223-1055 to match the OEM orientation, and secure it with three of the six included 5mm Allen bolts per valve. A 5mm Allen key is all that is required for mounting.

Will the TS-0223-1055 work with a tuned or modified C63?

Yes. The TS-0223-1055 is compatible with both stock ECU calibrations and aftermarket tunes. Because it uses the OEM solenoid connector, the ECU manages valve timing the same way regardless of tune state. If you are running a modified boost profile, the billet construction and high-temperature O-rings in the TS-0223-1055 are engineered to handle elevated boost pressures well beyond the stock M177 target.

Is the TS-0223-1055 compatible with all C63 body styles including Coupe and Cabriolet?

Yes. The TS-0223-1055 fits all 2015-2021 W205 C63 and C63 S variants, including the Sedan, Coupe, and Cabriolet. All three body styles share the same M177 4.0L twin-turbo V8 with identical turbocharger and compressor cover configurations, so the valve mounts the same way across all variants.

What tools are needed to install the TS-0223-1055?

You need a Torx bit set to remove the six OEM bolts per valve, a 5mm Allen key to install the three TS-0223-1055 mounting bolts per valve, and basic hand tools to access the engine vee on the M177. No cutting, drilling, welding, or special engine removal is required. The OEM solenoid connector unplugs and replugs directly into the TS-0223-1055 without any wiring modification.

Installation Overview

1. Allow the engine to cool completely before accessing the engine vee on the M177.
2. Locate both OEM diverter valves on the compressor cover housings of the left and right turbochargers in the engine vee.
3. Disconnect the OEM solenoid wiring connector from the first diverter valve.
4. Remove the six Torx bolts securing the OEM diverter valve to the compressor cover housing and carefully remove the valve.
5. Position the Turbosmart TS-0223-1055 Kompact EM DualPort VR29 in the same orientation as the OEM valve on the compressor cover housing.
6. Install three of the six included 5mm Allen bolts to secure the TS-0223-1055 to the compressor cover. Torque to specification using a 5mm Allen key.
7. Reconnect the OEM solenoid wiring connector directly to the TS-0223-1055 plug-and-play connector.
8. Repeat steps 3 through 7 for the second turbocharger on the opposite bank.
9. Secure any loose wiring using the included 100mm cable tie.
10. Start the engine, confirm no boost leaks at either valve, and verify normal ECU operation before driving.