Hptuners MPVI 4 Sale Price: $374.00 Original Price: $400.00 Hptuners newest tuning and diagnostic tool. To use this you will need a windows based laptop. Products › Hptuners MPVI 4 Add To Cart Added! Hptuners newest tuning and diagnostic tool. To use this you will need a windows based laptop. Hptuners credit $50.00 Add Added!