I think 6 is ideal for what were shooting for. 8 may be too much. I think honestly with how it ran on the 32 ECU, 6 will work pretty decent without a tune. It may have hiccups but not as bad as the NA ECU with 4 psi. 8 will be up to him and he'll just have to keep a very close eye on things. If anything it could be tuned out at that point.