SPEEDTECH N54 BORGWARNER S257 SX-E BOTTOM MOUNT KIT

BorgWarner S257 SX-E N54 Bottom Mount Turbo Kit

Take your BMW N54-powered build to the next level with our BorgWarner S257 SX-E Bottom Mount Turbo Kit. Engineered for exceptional fitment, performance, and long-term durability, this complete kit delivers fast spool, strong midrange, and top-end power with the unmistakable quality of BorgWarner's SX-E turbocharger series.

Whether you're building a responsive street car or a track monster, this system is designed to perform reliably under pressure.

✅ Included in the Kit:

• BorgWarner S257 SX-E Turbocharger
  T4 bolt pattern with T3 port sizes (can be ported to true T4 per BorgWarner specifications)

• T4 Bottom Mount Manifold
  Choose between Ceramic Coated or Non-Ceramic
  Includes studs and nuts

• Stainless Steel Tubing
  Mandrel-bent for optimal exhaust flow and durability

• Stainless Steel Wastegate Pipe
  Select Recirculated or Open Dump configuration

• RH Engine Mount Bracket
  Provides proper fitment with turbo positioning

• Coolant Block Manifold
  Designed for clean and effective coolant routing

• Silicone Coolant Hose

• Billet Oil Fittings (engine-side)

• Stainless Braided Oil Feed Hose

• Billet Coolant Fittings (engine-side)

• Silicone Turbo Inlet & Outlet

• High-Flow Air Filter

• Wastegate Options:
  Choose from:

  • Turbosmart Hypergate 45mm

  • TiAL MVR 44mm

  • PSR 45mm

  • Or choose “No Wastegate” if you are supplying your own

🛠 Fitment Notes:

• The S257 SX-E turbo uses a T4 bolt pattern with T3 port sizes. BorgWarner notes that the housing can be ported to a full T4 configuration if desired.

• U.S. Customers (non-forwarding addresses):
  The turbo ships separately from the rest of the kit and may arrive before or after.

• Down Payment Orders:
  Your entire kit will ship in a single box, including the turbo.

• International & Forwarding Service Orders:
  Shipments are sent in one box for convenience and tracking.

⏱ Lead Time:

4 to 6 weeks (Made to order)

🔧 Why Choose This Kit?

• BorgWarner’s S257 SX-E provides superior airflow, efficient boost response, and proven reliability in high-performance applications.

• Complete kit—no guesswork, no chasing parts.

• Perfect for street, drag, or track builds looking for a durable, high-output bottom-mount solution.