SPEEDTECH N54 BORGWARNER S257 SX-E TOP MOUNT KIT

BorgWarner S257 SX-E N54 Top Mount Turbo Kit

If you're ready to take your N54 build to the next level, the BorgWarner S257 SX-E Top Mount Turbo Kit offers premium components, precise fitment, and big power potential. Built around BorgWarner’s ultra-reliable SX-E series turbocharger, this kit delivers fast spool characteristics and exceptional top-end power — ideal for serious street builds, competitive time attack cars, and drag applications alike.

✅ What's Included in the Kit:

• BorgWarner S257 SX-E Turbocharger
  T4 bolt pattern / T3 port size housing (can be ported to true T4 per BorgWarner)

• T4 Top Mount Exhaust Manifold
  Choose Ceramic Coated or Non-Ceramic
  Includes manifold studs and nuts

• 2-Piece Stainless Steel Tubing
  Designed for ideal fitment and flow
  (Fabricating your own? Email us for a discount code to omit this option.)

• Stainless Steel Wastegate Pipe
  Choose Recirculated or Open Dump

• V-Band Clamps
  Heavy-duty, secure sealing for high-boost applications

• Billet CNC Aluminum Oil & Coolant Plugs
  Includes O-rings for leak-free performance

• Stainless Braided Oil Lines

  • -4AN Oil Feed Hose with AN fittings

  • -10AN Oil Drain Hose

  • Stainless Turbo Drain Fitting

  • Stainless -10AN Engine Block Fitting

• Aluminum Charge Pipe
  Lightweight and durable

• Silicone Couplers
  High-quality, heat-resistant for reliable boost sealing

• Coolant Expansion Tank Relocation Kit

• High-Performance Wastegate Options
  Choose one or run your own:

  • Turbosmart Hypergate 45mm

  • TiAL MVR 44mm

  • PSR 45mm

  • Or No Wastegate

🔧 Fitment Notes:

• The S257 SX-E turbo features a T4 bolt pattern with T3-sized ports. BorgWarner notes this can be ported to full T4 if desired.

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

• Down Payment Option:
  Kit ships as one complete box, including the turbo.

• International & Forwarding Service Orders:
  Kit ships as one package.

⏱ Lead Time:

4 to 6 weeks (Made to order)

🏁 Why Choose the S257 SX-E Top Mount Kit?

• BorgWarner’s SX-E series is known for fast spool, big power, and proven reliability.

• Top-mount design allows for easier turbo access, better heat management, and aggressive under-hood appearance.

• Includes all hardware and hoses, minimizing install complications.

• Optional tubing delete for custom fabrication flexibility.