Milltek Downpipes & Sports Cats for BMW 3 Series F80 M3 & M3 Competition Saloon (Non OPF/GPF Models Only) (2014-2018) – Improved Flow, Sports Catalyst
This is Milltek's large-bore downpipe with hi-flow sports cat for the BMW 4 Series F82/83 M4 Coupe/Convertible & M4 Competition Coupé (Non-OPF equipped models only). It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.
It sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.
In the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.
Specifications
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System Type: Large Bore Downpipes and Hi-Flow Sports Cats
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Pipe Diameter: 76.2mm (3")
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EC Approved: No
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Race System: Yes
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
- 76.2mm (3") pipework
- High-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 3 Series F80 M3 & M3 Competition Saloon (Non OPF/GPF Models Only) (2014-2018)
- BMW 4 Series F82/83 M4 Coupe/Convertible & M4 Competition Coupé (Non-OPF equipped models only) (2014-2018)
Not suitable for: the BMW 3 Series E90 M3 4.0 V8 Saloon/Sedan, which needs the Milltek Hi-Flow Sports Cat & Downpipe BMW 3 Series E90 M3 4.0 V8 Saloon 07-11.
Installation
Before ordering, note: Fits with Milltek Sport cat back system only - Requires Lambda Extensions. 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 3 Series F80 M3 M3 Comp Saloon Non OPF/GPF 14-18.
Will it fit the BMW 4 Series F82/83 M4 Coupe/Convertible & M4 Competition Coupé (Non-OPF equipped models only)?
Yes. Milltek lists this part for the BMW 4 Series F82/83 M4 Coupe/Convertible & M4 Competition Coupé (Non-OPF equipped models only) as well as the other models in the fitment list above.
Does it fit the BMW 3 Series E90 M3 4.0 V8 Saloon/Sedan?
No. For that car, choose the Milltek Hi-Flow Sports Cat & Downpipe BMW 3 Series E90 M3 4.0 V8 Saloon 07-11.
Is it road legal?
Milltek lists this as a race part without EC approval, so it is intended for off-road and competition use.
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?
No. Milltek states it must be fitted with the matching Milltek system, so budget for the cat-back as well.
How is a sports cat different from a de-cat?
A sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.
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.
