DPF Removal/Deletion

First of all we remove the internal filter only from the exhaust system, unlike other companies we do not fit a simple bypass pipe. Instead, we modify the original DPF unit by cutting a small window in the top of the DPF chamber, we then remove the internal filter, weld the window back into place and refit the DPF unit to the vehicle.

Once the physical filter removal has been completed the ECU (Electronic Control Unit) is reprogrammed and any DPF related structures removed from the vehicles software. This will prevent the vehicle from sensing the missing filter and will prevent future DPF regeneration and warning lights. This is the most important aspect of the removal process and it is vital that the ECU is reprogrammed correctly or DPF issues will continue. 

Removing the DPF from your vehicle is not only a cost effective solution but it also boasts the following advantages:

  • Increased performance

  • Increased efficiency (MPG)

  • Less turbo lag

  • Reduced maintenance costs

* Our DPF Removal service is sold for off-road use only. Removal of a DPF will almost invariably make your vehicle illegal for use on a public road. This is not legal advice and if you are unsure if this applies to your vehicle, please seek further advice.

EGR Removal / Deletion

The EGR valve (Exhaust Gas Recirculation) is an emission control device designed to reduce NOx emissions to help towards the ever more stringent Euro Emission Regulations. Castle Performance EGR Delete and EGR bypass software is designed to remove the functionality of the EGR valve to ensure it removes the running issues associated with these devices.


​As the EGR valve is constantly working with burnt exhaust gases they naturally have high soot content. This soot in the gases causes a build-up of carbon deposits around the valve operation area which in turn causes the valve to have a tendency to stick in various positions. For full engine performance the EGR valve is closed which creates a closed loop environment for the turbo system which allows it to pressurise. A problematic EGR can create an open loop environment for the turbo as it provides a feedback straight to the intake manifold and as a result can cause boost issues along with huge reductions in power and also fuel economy!

Benefits of EGR Removal / Deletion:

  • Restored Engine Power​​​

  • Restored MPG

  • Cleaner emissions as faulty EGR’s create much higher soot deposits

  • Can prevent DPF failure as the soot is caught in the DPF trap

  • Can prevent EGR replacement which can cost hundreds of pounds

  • Still 100% MOT compliant


Having your EGR Delete can save you money in repairs and in fuel costs. Castle Performance are at the forefront of EGR Removal and EGR Bypass software and can correctly remove the functionality from the software of most ECU types. Some companies will simply turn off the codes associated with it being unplugged but this is not the correct way. The EGR valve needs properly disabling to ensure it is not trying to recirculate exhausts gases whilst still physically working in the engine.