Altered vehicles must be re-approved by one of the NPRA’s Driver and Vehicle Licensing Offices. Among other things, a vehicle is deemed to be altered when:
- The engine output is changed (known as ‘chip tuning’)
- The vehicle group is changed, for example from a van to a passenger car
- The technical specifications are changed, such as the axle or total weight, or if the chassis is raised or lowered
- The energy source is changed, for example to gas, diesel or electric power
In addition, the vehicle must be approved if the rims or tyre dimensions are no longer in accordance with the vehicle manufacturer’s specifications.
Details about this can often be found in the vehicle registration certificate or the vehicle’s instruction manual.