Turbo Pressure Relief Kit for E550 & CLS550 | M278 V8 Biturbo

Protect your turbochargers and upgrade your forced-induction system with the Turbo Pressure Relief Kit, engineered specifically for Mercedes-AMG M278 twin-turbo V8 engines. This precision-designed kit helps prevent compressor surge, reducing stress on turbochargers and supporting long-term reliability—especially on tuned or aggressively driven vehicles.

Unlike factory recirculation systems that can allow pressure backflow during throttle lift, this system safely releases excess charge air, helping protect turbo internals and maintain consistent boost behavior during rapid shifts and spirited driving.

Key Features & Engineering Highlights

• Side-Mount Design: All current kits feature a side-mounted pressure relief valve configuration for improved packaging and consistent operation (not center-mounted).
• Enhanced Turbo Protection: Relieves excess boost pressure to reduce compressor surge and minimize turbocharger stress.
• M278-Specific Design: Optimized for the airflow characteristics and operating demands of the M278 twin-turbo platform.

Complete Kit Includes

• Modified charge pipes
• Custom silicone 90° elbow
• 38mm pressure relief (blow-off) valve
• MAP sensor tap
• Vacuum lines and required installation hardware

Factory Integration

This kit is designed to retain the factory AMG engine cover. Minor modification to the engine cover mounting bracket is required to ensure proper clearance and fitment.

Installation Notes

• Approximate 2-week preparation time prior to shipping
• Cutting of the engine cover mounting bracket is required
• Professional installation is recommended for optimal results

Vehicle Compatibility – M278 Engines

Compatible with Mercedes-Benz vehicles equipped with the M278 twin-turbo V8 engine:

• Mercedes-Benz S550 (2011–2017)
• Mercedes-Benz CL550 (2011–2014)
• Mercedes-Benz CLS550 (2011–2018)
• Mercedes-Benz E550 (2012–2014)
• Mercedes-Benz ML550 (2012–2014)
  

This turbo pressure relief kit is a functional performance upgrade designed to support long-term turbocharger reliability and smoother boost transitions on M278-powered vehicles. It is especially beneficial for owners running aftermarket tuning or increased boost pressure.

Upgrade with confidence. Protect your turbos. Drive your M278-powered AMG the way it was meant to be driven.