Hay all just wondering, my brother in law has an AU 1999 4.0l stocker pet/gas, it is in really good condition and has only got 160thou on the clock...

He has installed a cat back 2.5in system and is saving for headers and a Hiflow cat, also he is thinking about a flash tune...

Wat i was wondering is because the car is on pet and gas do u have to get the flash tune reprogramed to different settings or will a standed one work on the car...