Spool Plug and Play Motiv ReFlex+ Harness - G-Series B58 / S58
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: BMW G-chassis B58 (Gen 1 and Gen 2) and S58 with the automatic transmission. Check your tune's compatibility with us before ordering.
- Free US shipping over $250
- 30-day returns on unused parts
- Fitment help before you buy
Spool Performance B58 Gen 2 / S58 Plug-and-Play Reflex+ Harness The Spool Performance Plug-and-Play Harness is the ultimate solution for installing a Motiv Reflex+ on your B58 Gen 2 or S58-powered vehicle—no cutting, splicing, or depinning required. Unlike traditional installs that require tapping into the DME or accessing the cramped passenger-side footwell (a major challenge for mild hybrid models with the large battery cubby), our harness streamlines the process. Installation is fully reversible, making it easy to return to stock if needed. Why choose our harness over others? What sets our kit apart is its modular design. Rather than replacing the entire Reflex flying lead harness, our plug-and-play solution connects directly to it. You simply swap out the sub-harness that typically comes standard and replace it with ours.
Fits: BMW G-chassis B58 (Gen 1 and Gen 2) and S58 with the automatic transmission. Check your tune's compatibility with us before ordering.
Brand: Spool Performance
BMW G-chassis B58 (Gen 1 and Gen 2) and S58 with the automatic transmission. Check your tune's compatibility 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 | |
| M340i | G20/G21 | 2019+ | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021+ | Gen 2 B58 (TU) | |
| M240i | G42 | 2022+ | 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) | |
| M3 | G80/G81 | 2021+ | S58 (BMW M) | |
| M4 | G82/G83 | 2021+ | S58 (BMW M) | |
| M2 | G87 | 2023+ | S58 (BMW M) | |
| X3 M | F97 | 2020–2024 | S58 (BMW M) | |
| X4 M | F98 | 2020–2025 | S58 (BMW M) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Free US shipping on orders over $250.
- 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.
Pairs well with
Spool Full Race PTCAN-2 Motiv ReFlex+ Harness - G-Series B58 / S58
Motiv ReFlex+ 0-10 Bar Pressure Sensor
Motiv ReFlex+ Control Unit
