Pop the hood on any B58 BMW and the first thing you see is a big slab of black plastic. It does its job, but it looks like it was designed by the cost-cutting department. If you've already added carbon to your mirrors, spoiler, or interior, the engine bay is where the build falls flat.
The AutoTecknic B58 carbon fiber engine cover fixes that. It's a direct replacement for the factory plastic cover on the M240i, M340i, M440i, Z4 M40i, X3 M40i, and X4 M40i. It mounts to the same points, so there is no cutting, drilling, or trim work. Swap it at a car meet and people will ask if it came from BMW.
Real Prepreg Dry Carbon Fiber, Not a Wrap
This is 100% genuine carbon fiber. It isn't vinyl, it isn't hydro-dipped, and it isn't a carbon-look overlay on plastic. Each cover is laid up from prepreg carbon in a 2x2 twill weave and cured in a mold, the same construction method used for OEM BMW M Performance carbon parts. The weave size and pattern match factory M Performance 2x2 components, so it looks right next to the carbon you already have.
A deep gloss clear coat finishes the surface. Under the hood lights at night or in direct sun at a show, the weave has real depth that no printed finish can copy.
Why a Carbon Fiber Engine Cover on Your B58
The B58 is one of the best inline sixes BMW has built, and the engine bay should look the part. A carbon fiber engine cover is one of the few upgrades that changes the look of the whole bay with a single part. It also costs less than you might expect for how much it changes.
This is a cosmetic part. It does not change any intake, fuel, or emissions hardware, so there's no tune, coding, or emissions paperwork involved.
What's Included
- AutoTecknic prepreg dry carbon fiber B58 engine cover (gloss finish)
Key Features
- 100% genuine prepreg dry carbon fiber construction
- 2x2 twill weave matching BMW M Performance carbon components
- Deep gloss clear coat finish
- Direct replacement for the factory B58 plastic engine cover
- Uses factory mounting points, no cutting or drilling
- Reuses your original BMW roundel
- Cosmetic upgrade with no effect on emissions components
Vehicle Fitment
The AutoTecknic B58 carbon fiber engine cover fits the following BMW models:
- BMW G42 2 Series (2022-2026): M240i, M240i xDrive
- BMW G20 3 Series (2020-2026): M340i, M340i xDrive
- BMW G22 / G23 4 Series Coupe and Convertible (2021-2026): M440i, M440i xDrive
- BMW G26 4 Series Gran Coupe (2022-2026): M440i xDrive Gran Coupe
- BMW G29 Z4 (2020-2026): M40i
- BMW G01 X3 (2018-2024): M40i
- BMW G02 X4 (2019-2025): M40i
Not compatible with the Toyota GR Supra, the G45 X3 (2025+), or four-cylinder models such as the 230i, 330i, and 430i.
Installation Notes
If you can open your hood, you can install this. Expect about 10 minutes and no tools. The only step people miss is the roundel. Your factory BMW emblem has to come off the original cover and go onto the carbon one, so do this on a clean bench, not on the engine.
- With the engine cool, open the hood and lift the factory cover straight up to release it from its rubber mounting grommets.
- Carefully pry the BMW roundel off the original cover and clean any adhesive residue from its back.
- Install the roundel in the recess on the carbon cover.
- Line up the carbon cover's mounting pins with the factory grommets and press down evenly until it seats.
- Check that the cover sits flush and doesn't rock before you close the hood.
