Milltek GPF/OPF Bypass for BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 LCI (OPF/GPF Equipped Cars) (2021 onwards) – Filter Delete, Motorsport Use
This is Milltek's GPF/OPF bypass pipe for the BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 LCI (OPF/GPF Equipped Cars). It replaces the section of pipe housing the factory petrol particulate filter with a straight-through pipe, clearing the last major restriction left in a modern turbocharged petrol exhaust once a de-cat and remap are already in place.
It's aimed at owners already running a de-cat and a supporting remap who want to clear the final restriction in the system, not a bolt-on for a car that needs to stay road legal.
Because it removes the particulate filter, it's intended for off-road and competition use. A car with the GPF/OPF removed will fail an MOT emissions test and isn't legal to use on UK roads.
Specifications
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System Type: GPF/OPF Bypass
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Pipe Diameter: 80mm (3.15")
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EC Approved: No
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Race System: Yes
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Fitting Time: approx. 3 to 3.5 hours (Milltek figure)
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 80mm (3.15") pipework
- Straight-through pipe in place of the factory petrol particulate filter (off-road and competition use only)
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 LCI (OPF/GPF Equipped Cars) (2021 onwards)
Not suitable for: the BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 (Non OPF/GPF Cars), which needs the Milltek GPF/OPF Bypass BMW 5 Series M5 & M5 Comp 4.4l Twin Turbo F90 OPF/GPF 20-21; the BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (UK/European Spec Vehicles), which needs the Milltek GPF/OPF Bypass BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 UK & European Spec Vehicles 25+.
Installation
Milltek quotes a fitting time of approx. 3 to 3.5 hours. Before ordering, note: Fits to the OE Downpipes and OE OPF/GPF Back System. - For Vehicles with Flange Connection to OE Downpipes - Requires Stage 2 ECU Remap or OPF/GPF Bypass Module (Available from www.leib-engineering.de). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.
Upgrade Further
Also available from Milltek for this car: Milltek Cat-back Exhaust BMW 5 Series M5 & M5 Comp 4.4l Twin Turbo F90 LCI OPF/GPF 21+.
Does it fit the BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 (Non OPF/GPF Cars)?
No. For that car, choose the Milltek GPF/OPF Bypass BMW 5 Series M5 & M5 Comp 4.4l Twin Turbo F90 OPF/GPF 20-21.
Is it road legal?
No. Removing the particulate filter means the car will fail an MOT emissions test, so it is for off-road and competition use only.
Do I need a remap?
A suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.
Can I use it with my standard exhaust?
Yes. Milltek lists it for use with the factory (OE) exhaust system.
How long does it take to fit?
Milltek quotes approx. 3 to 3.5 hours.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
Is there a warranty?
Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.
