holden tunes?

[2004gmc]

how good is it to use the tunes from holden site is it a good idea to use them or make your own or are they more for refrence ?

[joecar]

They are for reference and/or for a starting point if you have a similar combo...

you should always use a wideband to tune your own...

don't rely on someone else's tune, their engine is different than yours (even if they are the same model/option).