with kalmaker and a 2 or 3 bar map sensor you are able to tune for boost. The best drop in option I know of is the supercharged 6 ones. I think the holden's run a different impedance injector to most things (can't remember if it is high or low).
That said, you often see haltechs cheap to suit holdens. Then you can do quite a bit of the tuning yourself, if you so wish.
That said, you often see haltechs cheap to suit holdens. Then you can do quite a bit of the tuning yourself, if you so wish.


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