Walton Motorsport BMW B58 Gen2 Type B High-Mount Turbo Manifold

Overview

Walton Motorsport BMW B58 Gen2 Type B High-Mount Turbo Manifold is the large-frame high-mount manifold for Gen2 B58 single-turbo builds where outright power capability and turbocharger packaging take priority over a smaller-frame response-focused system.

Key Features

• Type B high-mount architecture for larger-frame turbochargers.
• 304-grade stainless-steel construction.
• Port-matched runners pass through the cylinder-head flange and are TIG-welded on both sides before final blending.
• Walton proprietary cast merge collector designed for strong exhaust flow and wastegate priority.
• Turbosmart StraightGate50 wastegate-flange configuration.
• Manufactured in the United Kingdom.
• Walton Motorsport lifetime manifold warranty, subject to current manufacturer terms.

Supporting System Components

Walton currently supports this Gen2 package with large-frame turbocharger choices, downpipe options, StraightGate50 hardware, turbo oil-line components, the required pair of Gen2 coolant-port blanks and a Type B boost pipe to suit Osprey/FTP-style upper charge piping.

The Gen2 installation requires two coolant-port blanks. Custom exhaust fabrication may still be required depending on the selected turbocharger and vehicle specification.

Vehicle Fitment

• BMW G42 M240i — B58 Gen2
• BMW G20/G21 M340i — B58 Gen2
• BMW G22/G23/G26 M440i — B58 Gen2

Important: Walton currently states that this Type B manifold does not fit BMW 5 Series applications. Confirm exact chassis packaging and supporting hardware before ordering.

Available Options

Turbo Inlet Flange

• Turbosmart V-Band (Large Frame C Turbos) / HPT Frame 3 V-Band
• Precision Large Frame V-Band & Garrett V-Band (G40/G42/G45 Turbos)
• T4 Twin Scroll
• Borg Warner EFR V-Band
• Garrett V-Band (G25/G30/G35) / Turbosmart V-Band (Frame B Turbos) / HPT Frame 2
• Precision V-Band (T3 Frame THV Housings)
• T3 Single Scroll
• T4 Single Scroll

Wastegate Port

• Turbosmart Straightgate 50mm (Flange Fitted)

Lead Time

Built to order. Walton currently advises a typical manifold build time of approximately 2–4 weeks. Production timing is indicative and can change with supplier workload.

Installation & Calibration

Professional installation is recommended. A complete conversion can require turbocharger, wastegate, downpipe, oil-system, coolant, charge-pipe, intake and ECU calibration work depending on the selected combination.

Supplier

Walton Motorsport

BBT Support

Built by Boost & Tune can assist with system specification, fabrication, installation, supporting modifications and dyno calibration.