Select your Vehicle Detail

Buy Replacement Catalytic Converters for BMW M4

If your BMW M4 catalyst is not working effectively, it means an immediate replacement is required. But it is not that easy to find quality used or reconditioned catalyst converters at affordable prices. BM Engine Works is a reliable supplier of used and reconditioned BMW M4 catalyst converters at affordable prices.

BMW M4 Catalytic Converter Problems

BMW M4 catalytic converter problems can amplify the exhaust emissions and a decline in engine performance. Most problems shoot from sudden temperature changes. Extreme unburnt petrol in the exhaust can convert the catalyst into a bomb shell due to extremely high temperatures and damage the catalyst substances. As a result, the catalytic converter does not work properly and requires a replacement.

Warranty

Any purchased part from BM Engine Works, used, rebuilt, reconditioned or remanufactured comes with a standard warranty for your peace of mind. We also offer nationwide delivery services to our customers.

Enter REG
Enter Reg

Enter BMW's registration number to locate replacement engine ancillary parts that fit your car.

Select Part
Part

Select the part or parts you are searching for your vehicle and confirm contact details.

View Prices
View Prices

View the prices of all the used and reconditioned engine ancillary parts that will fit your vehicle available in stock.

Place Your Order
Place Your Order

Order online for a quick delivery or book an appointment for our supply and fit service.

500+ Latest Customer Reviews

Youtube reviews
On Point Service, 10 Out of 10
Youtube reviews
Daily Updates and Fixed Price
Youtube reviews
Reliable Service, Quick Service, Quick Turnaround
Youtube reviews
Brilliant. No Crazy Surprises
Youtube reviews
It's all fixed, thank you
Youtube reviews
Thankful for all the work that BM Engine Work has done

BMW Transformation Gallery

BMW Restoration Stories

Project Name

BMW M4 3.0 S55B30A – Low Mileage Engine Upgrade

BMW M4 3.0 S55B30A – Low Mileage Engine Upgrade Vehicle In 01-Dec-2025 Vehicle Out 05-Dec-2025

Initial Diagnosis

This track ready BMW M4 required an engine upgrade instead of factory unit. We provided S55B30A engine and fitted it perfectly,ensuring stronger Performance.

Click to Discover More

Project Name

BMW M4 S55B30A – Reconditioned Engine Installation

BMW M4 S55B30A – Reconditioned Engine Installation Vehicle In 20-Oct-2025 Vehicle Out 24-Oct-2025

Initial Diagnosis

Vehicle arrived with a knocking sound from the bottom end of the engine. Crankshaft and con rod bearing damage was found, requiring a complete BMW M4 engine Replacement.

Click to Discover More