If you own a modern BMW with a petrol engine - particularly one from 2018 onwards - you have likely come across the terms OPF or GPF in performance forums and tuning communities. This guide explains what these filters are, why some drivers choose to have them removed or coded out, and how LBS Performance's remote coding service works.
What is an OPF or GPF?
OPF stands for Otto Particle Filter. It is also referred to as a GPF (Gasoline Particulate Filter). BMW introduced it on many petrol models from 2018 onwards to comply with stricter Euro 6d emissions regulations. The filter captures fine particulate matter from exhaust gases before they leave the tailpipe.
While it serves an important environmental purpose in standard use, the OPF has become a common point of discussion in the performance and tuning community due to its effect on exhaust character and, in some tuned applications, peak power output.
How does the OPF affect a modified BMW?
The OPF adds back pressure to the exhaust system. In a standard car this is largely unnoticeable, but for drivers who have remapped their BMW or fitted a performance exhaust, the filter can become a restriction. The most commonly reported effects are:
- A muffled or suppressed exhaust note compared to what the exhaust is capable of producing
- Slight restriction on power in highly tuned applications where exhaust flow is critical
- Periodic regeneration cycles where the engine management actively burns off collected particulates, which can affect throttle response briefly
What does OPF removal actually involve?
There are two approaches, and it is important to understand the difference:
Physical removal
The filter substrate is physically removed from the exhaust housing, either by gutting the existing unit or replacing it with a decat section. This requires a visit to an exhaust specialist and is a physical modification to the car.
Software coding (OPF delete)
The ECU is recoded to remove the active management of the OPF - including regeneration cycles and filter load monitoring. This is what LBS Performance offer as a remote coding service. It does not physically remove the filter but stops the engine management system from interacting with it, which in combination with a physically removed or gutted OPF gives the best overall result.
Many customers use LBS Performance's coding service alongside physical OPF removal carried out by their local exhaust specialist, as both steps together deliver the cleanest and most complete outcome.
How does the remote coding service work?
The OPF coding is carried out remotely via a secure screen share session, exactly like LBS Performance's other remote coding services. You will need:
- A Windows laptop running Windows 8 or newer
- A BMW ENET OBD2 cable (available on Amazon or eBay for around £10 to £15)
- A stable internet connection
LBS Performance connect to your car's ECU remotely, carry out the coding changes, and the session is typically complete within 30 to 45 minutes. No garage visit, no physical work on the car.
Which BMW models are supported?
The OPF coding service is available for a range of BMW F-Series and G-Series petrol models fitted with the Otto Particle Filter. Not sure if your vehicle is supported? Use our free VIN compatibility checker or get in touch with your registration details and we will confirm before you order.
How much does it cost?
LBS Performance's PPF/OPF/GPF coding service is priced at £75.
Common questions
Do I need to physically remove the OPF first?
No. The coding service can be carried out independently of any physical work. However, for the full benefit on exhaust sound and flow, most customers combine the software coding with physical OPF removal by an exhaust specialist.
Will this affect my MOT?
This depends on whether the filter has been physically removed and the emissions test standards applicable to your vehicle. OPF coding alone (without physical removal) is unlikely to affect emissions test results, but you should check the current MOT standards for your vehicle's age and registration. LBS Performance recommend taking advice from your local MOT station if you are unsure.
Is the coding reversible?
Yes. All coding carried out by LBS Performance is fully reversible. If you need the OPF management restored - for an MOT, a dealer visit or any other reason - LBS Performance can revert the coding in a follow-up session.
Please note: OPF/GPF removal may affect your vehicle's emissions compliance and could have implications for your MOT result or insurance cover depending on how the modification is carried out. LBS Performance recommend checking the legal position in your region before proceeding. This service is commonly used for track, competition or off-road applications.
Ready to proceed? Use our compatibility checker to confirm your vehicle, or go straight to the PPF/OPF/GPF Coding product page to place your order.