BMW B58 OPF Decat Downpipe with Heat Shield – M340i 440i 540i 640i 740i 840i Z4 M40i Toyota Supra A90 GR
Unlock serious performance and sound with this 4.5 inch stainless steel decat downpipe for BMW B58 OPF and PPF engines. This catless de-cat downpipe with heat shield is engineered for BMW G-series M340i, 440i, 540i, 640i, 740i, 840i, Z4 M40i and Toyota GR Supra A90 OPF models. Built from SS304 aircraft-grade stainless steel and TIG welded in house, it delivers sharper throttle response, faster turbo spool, reduced backpressure and a more aggressive exhaust note.
We have installed and used this downpipe ourselves at Nforcd, and customer feedback has been consistently positive. On our testing we saw gains of around 20 to 25 bhp, alongside noticeable improvements in drivability and sound.
Why choose this BMW B58 OPF decat downpipe
- 4.5 inch stainless steel pipe straight out of the turbo for rapid turbo spool and sharper throttle response
- SS304 aircraft-grade stainless steel construction, TIG welded in house for strength and durability
- Mandrel-bent for maximum internal diameter and optimal exhaust gas flow without sacrificing mid-range torque
- Lower exhaust gas temperatures and reduced backpressure by relieving the turbocharger
- Substantial weight saving compared with the factory catalytic converter
- Includes heat shield
- Transforms sound with a deep, aggressive exhaust note
Perfect fit for BMW B58 OPF and PPF models
Designed specifically for OPF and PPF cars. Direct fitment for:
- BMW G20 and G21 M340i 3.0L 285 kW 374 PS 2019 OPF model
- BMW G22 440i 3.0L 285 kW 387 PS 2019 OPF model
- BMW G30 and G31 540i 3.0L 250 kW 340 PS 2018 OPF model
- BMW G32 640i 3.0L 250 kW 340 PS 2018 OPF model
- BMW G11 and G12 740i 3.0L 240 kW 326 PS 2019 OPF model
- BMW G14, G15 and G16 840i 3.0L 250 kW 340 PS 2019 OPF model
- BMW Z4 G29 M40i 3.0L 250 kW 340 PS 2019 OPF model
- Toyota Supra MK5 A90 GR 3.0L 250 kW 340 PS 2019 OPF model
Real-world results
We have tested this product and found increases of around 20 to 25 bhp. Expect a stronger mid-range, quicker response and a louder, sportier exhaust tone. Many of our customers comment on the improved drivability and the quality of the welds and finish.
Installation notes
- Professional installation recommended. Tolerances can vary and some exhaust systems sit slightly differently, though feedback shows this downpipe is generally easy to fit
- Swap the gasket at the turbo end of the downpipe to prevent a fuel smell in the cabin
- We recommend adding Lambda Sensor Spacer(s) to help prevent the engine light coming on in most cases. Search our other items for suitable spacers
Fitting service by Nforcd
Want it fitted by specialists who know these cars inside out? Nforcd offers professional installation in Warwickshire. For a fitting quote, email Sales@nforcd.com.
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