That sure is a pretty 240z.
So, I've been running a new Basher 2S 5600 60C LiHV pack with my 4300KV Castle setup in my XV-01. I honestly cannot tell a bit of difference between that and the 3 year old Dynamite Speedpack 2S 5300 30C I've been using in it.
Same results in other vehicles as well. Just can't tell a difference. It's a nice battery. It's smaller, lighter and gives the same performance so there is that but .3 volts or whatever just isn't enough to notice a difference in a vehicle that already hauled serious booty on 2S.
I've gone back to the Delta HV too. I just like it better than the Stratos.