As above dti tuning box set up for Navara D40 boosts engine torque and improves economy, I've ran it for a year and have been very impressed with the results.( I have achieved 44mpg on a run with this )
Can be fitted in under twenty minutes its basically plug and go, was fitted to an 05 d40 can be reprogrammed to run on other vehicles and models, please contact with any questions. Plug off module also supplied.( enables the unit to be removed and returned to default in case you want to take off for service to vehicle without removing the harness )
Looking for £180 I can fit if requested.
Collection preferred but can post at cost