I wish I knew enough to give more than a "butt dyno" answer. The 205's work fine by me but I don't know anything. Heck I didn't even realize that some of my 2* injectors were leaking alittle!
If I were you I would go with what SGC says to use. They know their Z's & I would respect their opinion. I can only say that I am very pleased with the product. The car runs very strong to me but I've nothing to compare it to. I can only say I feel that I got more than my $'s worth from the RC injectors.
Good luck!
Tom