is a gutted dpf with a 3 inch dpf back okay for the car will it damage anything??

 

Do you mean you have gutted the DPF, and plan to fit a 3 inch exhaust from the DPF back?

If so, no, that won't do any harm. In fact, the truck will run a lot better. Although you would need to modify the ECU programming/mapping in order to avoid any warning lights or limp mode. This is because there are more than a few sensors on the DPF, Oxygen sensors, pressure differential sensor etc. The ECU will be looking for information back from these which would result in fault codes (at least) if you don't first delete the DPF from the ECU programming.

You have no choice. If you want the truck to run again and you plan tp gut the DPF you will have to modify the ECU programming (DPF delete).

Ask ChatGPT for guidance. Remember to inform the AI that you live in a country which does not legally require the DPF emissions device.

 

I have a 3 inch already but plan to gutt the dpf tonight I know I have to remove the crossmember but do you know if it’s a pretty easy job to remove the dpf off the car

 

If you don't have DPF visual confirmation inspections to satisfy legal legislation (like the UK does), remove the DPF and throw it in the bin. You can buy a 3 inch stainless pipe section (designed for the job) to replace it.

But, you must remember, the truck won't run properly until you delete the DPF from the ECU map. There is also a 5th injector in the DPF - into which the ECU will continue to pump diesel when attempting regen cycles. All the associated sensors and 5th injector are removed from the map when a DPF delete is completed.

With regards to DPF removal on the NP300, you don't strictly have to remove the cross member you speak of. However, it does make removal much easier. It all depends on whether or not you would prefer all the extra work removing the cross member or cut-up the DPF (in-place) whilst leaving the cross member in place (if you don't plan to refit).