Milltek Maxton Diffuser Quad Outlet for BMW 1 Series 128ti 5 Door (F40 OPF/GPF Equipped) (2021 onwards) – Genuine Milltek Fitment Part
This is Milltek's diffuser for the BMW 1 Series 128ti 5 Door (F40 OPF/GPF Equipped). It's a rear diffuser, produced in collaboration with Maxton Design, styled to complement the matching Milltek exhaust tailpipes rather than change how the exhaust itself performs.
Specifications
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System Type: Additional parts
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EC Approved: No
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Race System: No
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Genuine Milltek part designed to work with the matching Milltek system
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 1 Series 128ti 5 Door (F40 OPF/GPF Equipped) (2021 onwards)
- BMW 1 Series M135i xDrive 5 Door (F40 OPF/GPF Equipped) (2019 onwards)
Not suitable for: any model, engine or body style not listed above. Check your car before ordering.
Installation
We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
Upgrade Further
Also available from Milltek for this car: Milltek GPF/OPF Bypass BMW 1 Series 128ti 5dr F40 OPF/GPF 21+, Milltek Filter-back Exhaust BMW 1 Series 128ti 5dr F40 OPF/GPF 21+.
Will it fit the BMW 1 Series M135i xDrive 5 Door (F40 OPF/GPF Equipped)?
Yes. Milltek lists this part for the BMW 1 Series M135i xDrive 5 Door (F40 OPF/GPF Equipped) as well as the other models in the fitment list above.
Is it road legal?
Milltek does not list EC approval for this part. Any exhaust used on the road must still meet noise and emissions rules, so check the requirements where you live.
What does it work with?
Milltek notes: "Maxton Diffuser for Quad Outlet System (M2 Style) - Gloss". Check this matches your current exhaust before ordering.
Is this a complete exhaust system?
No. It is designed to be used with the system or factory parts described above, rather than as a complete exhaust on its own.
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.
