BMW N54 335i Top Mount Turbo Hot Parts Kit

The Doc Race N54 Top Mount Turbo Hot Parts Kit for BMW 335i is engineered for single turbo conversions on the BMW N54 platform. Designed for strength, fitment, and high-boost performance, this kit provides the essential hot-side components needed to support a T4 twin scroll turbocharger setup on the E90, E92, and E93 335i.

Built specifically for the 3.0L inline-six N54 found in the BMW 335i, this top mount configuration improves turbo placement, simplifies serviceability, and allows for proper twin scroll exhaust energy management—maximizing spool response and high-RPM power potential.

What’s Included in the Doc Race N54 Hot Parts Kit:

• Single-Piece Turbo Manifold
  Designed for use with a T4 twin scroll turbocharger and dual 40mm wastegates, the updated one-piece manifold replaces the older multi-piece design (shown in some photos). The robust construction improves durability under extreme heat and high boost conditions while maintaining optimal exhaust flow to the turbine housing.
• Downpipe (Factory Exhaust Location Fitment)
  Included is a precision-built downpipe that connects directly to the factory exhaust location, making integration with your existing exhaust system straightforward. This ensures proper routing and reliable fitment for street or track builds.
• (2) Turbosmart 40mm Wastegate Dump Tubes
  The kit includes dual dump tubes designed for use with Turbosmart 40mm wastegates, allowing for accurate boost control and efficient exhaust gas evacuation under high load.

Ceramic Coated for Heat Management
All hot parts in this kit come professionally ceramic coated in satin black. The ceramic coating helps reduce engine bay temperatures, improve thermal efficiency, and protect components from corrosion and heat-related fatigue. While some product images may show raw-finish components, all shipped kits include the satin black ceramic coating.

Designed for High-Power BMW N54 Builds
The BMW N54 engine has earned a reputation for tuning potential, and a properly engineered top mount single turbo setup is key for pushing beyond the limitations of the factory twin turbos. This Doc Race hot parts kit provides a proven foundation for high-horsepower street, drag, and roll racing builds.

Whether upgrading a stock 335i or building a fully forged N54 engine, this top mount turbo hot parts kit delivers the durability, fitment precision, and performance capability serious builders demand.

Compatible with: BMW 335i N54 (E90 / E92 / E93)