
Kelford Cams Camshaft Set - B58 Gen 2 / A90 Supra
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: BMW M340i (G20), M440i (G22), M240i (G42), Z4 M40i (G29), 540i (G30, 2020+), 740i (G11, 2020+), X3/X4 M40i (2020+); Toyota GR Supra 3.0 (A90/A91). Confirm your exact car with us before ordering.
For off-road / competition use only. Not legal for use on public roads in the United States, including California.
- Shipping at real carrier rates
- 30-day returns on unused parts
- Fitment help before you buy
These are Kelford's performance camshafts for the Gen 2 B58, sold as a set. They suit an engine that already has intake, exhaust and turbo upgrades bolted on, and Kelford pitches the base grind at roughly 550 to 750 hp on a 58 to 68 mm turbo. Valvetronic and dual VANOS stay fully functional, so throttle response and a wide powerband are kept.
What you get
- Three grind choices. A is 270°/268° duration with 10.30 mm/10.15 mm lift. B is 285°/280° with 10.30 mm/10.60 mm. C is 288°/288° with 10.35 mm/10.80 mm.
- Built for bolt-on turbo builds, with grind A matched to the 550 to 750 hp range.
- Keeps the factory variable valve systems working, so the car stays responsive on the street.
Good to know
- A valve spring upgrade is mandatory. Kelford recommends their KVS58-BT spring kit.
Brand: Kelford Cams · Part #: 258-A, 258-C, 258-B
For off-road / competition use only. Not legal for use on public roads in the United States, including California.
BMW M340i (G20), M440i (G22), M240i (G42), Z4 M40i (G29), 540i (G30, 2020+), 740i (G11, 2020+), X3/X4 M40i (2020+); Toyota GR Supra 3.0 (A90/A91). Confirm your exact car with us before ordering.
| Model | Chassis | Years | Engine | Fits |
|---|---|---|---|---|
| M140i | F20/F21 | 2016–2019 | Gen 1 B58 | |
| M240i | F22/F23 | 2016–2021 | Gen 1 B58 | |
| 340i | F30/F31/F34 | 2016–2019 | Gen 1 B58 | |
| 440i | F32/F33/F36 | 2017–2020 | Gen 1 B58 | |
| 540i | G30/G31 | 2017–2019 | Gen 1 B58 | |
| 740i | G11/G12 | 2016–2019 | Gen 1 B58 | |
| X3 M40i | G01 | 2018–2019 | Gen 1 B58 | |
| X4 M40i | G02 | 2019 | Gen 1 B58 | |
| 640i GT | G32 | 2018–2019 | Gen 1 B58 | |
| M340i | G20/G21 | 2019–2024 | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021–2024 | Gen 2 B58 (TU) | |
| M240i | G42 | 2022–2024 | Gen 2 B58 (TU) | |
| Z4 M40i | G29 | 2019+ | Gen 2 B58 (TU) | |
| GR Supra 3.0 | A90/A91 | 2020+ | Gen 2 B58 (TU) | |
| 540i | G30/G31 | 2020–2023 | Gen 2 B58 (TU) | |
| 740i | G11/G12 | 2020–2022 | Gen 2 B58 (TU) | |
| X3 M40i | G01 | 2020+ | Gen 2 B58 (TU) | |
| X4 M40i | G02 | 2020+ | Gen 2 B58 (TU) | |
| X5 xDrive40i | G05 | 2019–2023 | Gen 2 B58 (TU) | |
| X6 xDrive40i | G06 | 2020–2023 | Gen 2 B58 (TU) | |
| X7 xDrive40i | G07 | 2019–2022 | Gen 2 B58 (TU) | |
| 840i | G14/G15/G16 | 2019+ | Gen 2 B58 (TU) | |
| INEOS Grenadier | Station Wagon/Quartermaster | 2023+ | Gen 2 B58 (TU) | |
| M340i | G20/G21 | 2025+ | Gen 3 B58 (48V) | |
| M440i | G22/G23/G26 | 2025+ | Gen 3 B58 (48V) | |
| M240i | G42 | 2025+ | Gen 3 B58 (48V) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
- Unused parts can be returned within 30 days. Some items are marked no-refund in their description.
Full details are on our shipping and returns page.
Guides for this part
B58 Common Problems by Generation (Gen 1, Gen 2 and 2025+) and the Parts That Fix Them
The B58 is one of BMW's most reliable modern engines, and most of its problems are leaks, not failures. The ones that come up again and again are the oil filter housing gasket, coolant leaks (water pump, expansion tank,
Best A90 Supra Mods, In the Order to Do Them (GR Supra 3.0)
Tune it first. On a GR Supra 3.0, a flash tune or a JB4 is the biggest gain per dollar. Next, add a downpipe and a Stage 2 map, and a better heat exchanger so the car stays strong on hot days. After that comes fuel: flex
Best B58 Mods, In the Order to Do Them
Start with a tune. It is the biggest gain per dollar on any B58. Then add a downpipe and a Stage 2 map, then an upgraded high-pressure fuel pump (HPFP) and an ethanol blend. Only after that should you think about a bigge
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