[sideshow]

the biggest thing we find is the cats
use factory cats
we put nearly the same tune in most engines with similar setups and some pass some dont
maybe put new o2s especially ls1 motors as they are old now

i thought ls3s in australia still used ve 6lt style maf
and corvettes use the blade type
tune for the maf is different betweent he two types of air flow meters so make sure to use the right one for the tune
we also have run mafles sand maf and sometimes the mafless pass and the maf doesnt

in the end we says its 90% will fail due to the cats if the tune is nearly std