Your original catalytic converter will typically have 400 or 600 Cells per square inch (CPSI)? these original cats are restrictive in their flow? typically allowing an open area of around 55-65%

Milltek Sport Hi-Flow Sports Cat which will be fully integrated into a large bore downpipe? has only 100-200 CPSI depending on application

These cats have an open area of between 75-85%? thus reducing back pressure substantially and increasing flow rates? all very desirable for extracting more performance? especially on Turbo-Charged engines.

• Emission levels are maintained at legal limits by careful selection of the volume of the metallic substrate.
• Lamda probe positions remain unchanged from the original equipment.
• Manufactured from 304 aircraft grade stainless steel.

This Milltek Kit Includes:

• MSBM266: LH Primary Cat Rep Downpipe
• MSBM267: RH Primary Cat Rep Downpipe
• MSBM268: High Flow 200cpsi Twin Cat Assembly (under floor)

NOTES:

Fits with Milltek Sport cat back system only - Requires Lambda Extensions

There?s no better place in the UK to supply you with your superb Milltek exhaust products than Milltek? we are literally a stone?s throw away from Milltek?s Head Quarters and factory in the centre of Derby.

FITMENT

BMW 3 Series F80 M3 Saloon 2014-2017

BMW 4 Series F82 M4 Coupe 2014-2017