B58 Gen 1 & TU 6-port turbo kit - BorgWarner EFR 8374 / 8474 / 9174

Full single-turbo conversion for B58 Gen 1 and B58 TU 6-port engines - fits M140i, M240i, 340i, 440i, X3 M40i (F20-F36, G01). No adapters, no guesswork.

• BigBoost twin-scroll manifold - 40% larger runners, external wastegate port for precise boost control
• Complete system - 4" aluminium inlet, lower boost pipe, aviation stainless oil feed lines, Smart Seal clamps, engraved heat shield, VPE V-band
• Turbo options - EFR 8374 (650 whp), 8474 / 9174 (750 whp), 9280 (1000 whp)
• Includes all gaskets, coolant hoses, oil lines and EWG linkage - ready to bolt on

Requires custom tuning (MHD or BM3 recommended). Fast road or track day use - not a daily-driver compromise.