N55 F-Chassis GTX-SERIES Turbo Kit

BigBoost Stage 3 Turbo Kit – Garrett GTX Gen2 for B58 Gen 1 (RWD)

Track-Tested, Street-Ready. No Compromises.

Unlock the full potential of your B58 Gen 1 engine with the BigBoost Stage 3 Turbo Kit, featuring genuine Garrett GTX Gen2 turbos and premium hardware throughout. Developed through extensive dyno and endurance racing validation, this kit delivers industry-leading performance with OEM+ fitment and no unnecessary modifications.

✅ What’s Included:

• Twin Scroll Manifold with 1.5″ runners — equal-length design for all 6 cylinders

• Genuine Garrett GTX Gen2 Turbocharger

  • Choose: GTX3582R Gen2 (GTX800) or GTX3584RS (GTX1000)

• Turbosmart or TiAL 38mm External Wastegate

• 4-Ply Silicone Hoses – High-heat and pressure resistant

• V-Band Clamps – Quick-release and leak-proof

• Coolant Aeroquip Hoses – Motorsport-grade quality

• Hard Pipe for Cooling System – Robust and reliable

• Billet Aluminum Intercooler Coupler – Durable and precise fit

• Boost Pipe

• 2-Piece 3″ Turbocharger Inlet

• VTA Diverter Valve (DV) System – Vent-to-atmosphere for signature sound

• Stainless Steel Braided AN Oil Feed Lines

• Oil Feed and Drain Couplers & Aeroquip Drain Hose

• All Stainless Steel Hose Clamps – Including Oetiker and constant-pressure types

🔧 Why Go Stage 3 with BigBoost?

• Race-Proven Design: Optimized via rigorous internal testing—individual EGTs and backpressure data show ideal 1.11–1.12:1 EMAP ratios.

• Track-Endurance Certified: Trusted by teams running 6–12 hour endurance races with outstanding reliability.

• OEM-Compatible:

  • No water pump relocation

  • No RH engine mount bracket changes (RWD only)

• Installation Made Easy:

  • Detailed install guide with 100+ photos

  • Retains OEM fitment wherever possible

• Top-Tier Support:

  • Reach us via text, Facebook, Instagram, WhatsApp, or email

  • Industry-leading <10 minute response times from the BigBoost Team

• Tuning Support Included:

  • Custom tuning assistance via MHD/BM3 platforms

• Made with Pride:

  • Zero Chinese parts

  • Components sourced and built in the USA and South America

⚠️ Fitment Note: This kit is for RWD Gen 1 B58 applications only. Please review the fitment guide before ordering.
📦 Availability: Kits are built to order — allow lead time of approximately 4–5 weeks.