Nissan is confused on what to do. They don't want to bump the horsepower on the current Z in fear that it will hinder the sales of the GTR. From a manufacture's point of view it would be stupid to have two cars produce fairly similar power when one is less than half the price of the other one.
A factory TT Z with 450 HP can easily rival a 550-600 HP GTR with a few simple mod.
I personally don't think Nissan will ever do do that. If they did that'll be the end of the GTR. People will go, "hey I can buy a Z for less than half of a GTR and make it quicker"!
Dropping weight and using the Juke Nismo RS engine to compete with the BRZ/FRS is much more financially beneficial for Nissan.
