Cobb Tune for Nismo
 

What do you guys think will happen for the nismo owners like myself for the tunes. Will cobb create a custom tune for the nismo or will they just remove the nismo tune and flash their own?

It's not like the tuners typically modify the maps per se. It just a different map, timing, etc. I'd consider it a blank slate more or less regardless os Nismo or not. The Nismo is really just a regular Z with a mediocre exhaust.