Aosuracing Turbo Heat Shield — B58 F/G-Series M140i M240i 340i 440i
by Aosuracing
Key Features
- High-grade steel construction engineered for sustained turbocharger heat resistance
- Fits Gen 1 and Gen 2 six-port B58 turbos, stock and hybrid configurations
- Compatible with BMW F/G-Series M140i, M240i, M340i, M440i, Z4 M40i, and Toyota Supra A91
- Direct bolt-on fitment — no cutting, drilling, or modification required
- Reduces heat soak to help maintain consistent intake and oil temperatures under load
- Shields surrounding engine bay components from sustained turbo radiant heat
Product Details
- Brand
- Aosuracing
- Part #
- BUS039-BK
- Category
- Turbo Heat Shields & Blankets
- ASIN
- B0FCLKHZ93
Check if it fits your BMW
Aosuracing Turbo Heat Shield — B58 F/G-Series M140i M240i 340i 440i — Overview
Heat soak is a silent performance killer on the B58, and Aosuracing engineered this turbo heat shield specifically to combat it. Fabricated from high-grade steel selected for its thermal resistance properties, the shield forms a dedicated barrier around the turbocharger, limiting radiant heat transfer to nearby intake components, oil lines, and surrounding engine bay hardware. The result is more consistent temperatures under sustained hard driving — exactly the conditions where heat soak does the most damage.
Fitment coverage on this shield is genuinely broad. It supports both Gen 1 and Gen 2 six-port B58 applications across the BMW F-Series lineup — M140i, M240i, 340i, 440i — and extends to the G-Series M340i, M440i, and Z4 M40i, as well as the Toyota Supra A91. Crucially, compatibility isn't limited to stock turbos. If you're running a hybrid unit as part of a larger power build, this shield fits those setups too, making it a relevant upgrade at virtually any stage of B58 development.
Installation follows a direct bolt-on process with no modifications required — no cutting, no drilling, no fabrication. It mounts using existing hardware points, keeping the job accessible even for enthusiasts without a professional shop setup. For a platform as tuning-friendly as the B58, this is the kind of foundational protection that pays dividends whether you're on a stock map or pushing elevated boost targets.
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