I mean just look:
Nismo
https://conceptzperformance.com/nism...z4_p_37713.php
SPL
https://www.splparts.com/products/fr...-370z-g37.html
There is an outright statement somewhere i just can't find it
But if you have a nismo hookup that can you the Nismo version shipped to you cheaper, thats pretty awesome, they DO look like hotness. Silver-red >>> black-blue
If i had money to set on fire i'd swap out my SPL stuff for new Nismo versions