BMW Z4 M40i OPF Decat Downpipe B58 – High Flow Stainless Steel Catless Downpipe for OPF PPF Models
Unlock power, sound and response with our BMW B58 OPF decat downpipe. This stainless steel catless downpipe is designed for OPF PPF models and is ideal for owners searching for BMW Z4 M40i downpipe, BMW B58 downpipe, BMW M340i downpipe, BMW 440i downpipe, BMW 540i downpipe, BMW 640i downpipe, BMW 740i downpipe, BMW 840i downpipe and Toyota Supra A90 GR downpipe upgrades. Expect faster turbo spool, sharper throttle response, a more aggressive exhaust note and a notable weight saving versus the factory catalytic converter.
- Machined from SS304 aircraft-grade stainless steel and TIG welded in-house for durability and premium finish.
- 4.5 inch stainless steel construction with a 3.5 inch section straight out of the turbo for maximum flow on B58 engines.
- Mandrel-bent for smooth gas flow and maximum internal diameter to deliver ultimate performance without losing mid-range torque.
- Noticeable power gains with our testing showing increases of around 20 to 25 bhp on B58 OPF models.
- Lower exhaust gas temperatures and reduced backpressure relieve the turbocharger and improve cylinder charge.
- Substantial weight saving compared with the restrictive factory catalytic converter.
- Aggressive exhaust tone that enhances the BMW B58 character while improving performance.
This B58 OPF decat downpipe is a direct-fit bolt-on upgrade for OPF PPF vehicles only. Perfect for enthusiasts searching for BMW Z4 M40i OPF decat, BMW B58 OPF downpipe, BMW G29 Z4 downpipe, BMW G20 G21 M340i downpipe, BMW G22 440i downpipe and Toyota Supra A90 GR OPF downpipe.
Fitment – OPF PPF Models Only
- BMW G20 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 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 G12 740i 3.0L 240 kW 326 PS – 2019 OPF model
- BMW G14 G15 G16 840i 3.0L 250 kW 340 PS – 2019 OPF model
- BMW G29 Z4 M40i 3.0L 250 kW 340 PS – 2019 OPF model
- Toyota Supra MK5 A90 GR 3.0L 250 kW 340 PS – 2019 OPF model
Reference: Original BMW part number 18329897313.
Why Choose This BMW B58 OPF Decat Downpipe
We have used and tested this product in-house and customers consistently report improved drivability, quicker spool, stronger mid-range punch and a deeper, more purposeful exhaust note. If you are searching for a BMW Z4 M40i downpipe or a BMW B58 decat downpipe that delivers real-world gains, this is the upgrade to choose.
Installation and Notes
- Professional installation recommended. Tolerances can vary between exhaust systems, but feedback indicates a straightforward fit.
- You will need to swap the gasket at the turbo end of the downpipe. Failure to do so can result in a fuel smell in the cabin.
- We recommend adding a Lambda Sensor Spacer to help prevent a check engine light in most cases. You can find Lambda O2 sensor spacers in our store.
Fitting Service
Want it fitted by specialists who know performance BMW B58 exhausts inside out? Book fitting with Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
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