Often spoken about and a constantly recurring topic in Unsealed 4 X 4 mag online:

Flash Tunes or Modules.

https://dieselcare.com.au/chip-or-tune?utm_source=ActiveCampaign&utm_medium=email&utm_content=Auto%20fuses%20-%20a%20guide%20to%20not%20letting%20your%204X4%20burn%20to%20the%20ground&utm_campaign=Unsealed%204X4%20EDM%20-%2010%20Feb%2025

B