sundown nightshade

Thinking of switching from my sp4 15 to either a zv4 18 or nightshade v3 18. My question is will there even be a real big difference between the two? Is the night shade that much better than the zv4 or should I save the $200 and go with the zv4. I will have a crescendo bc3500 to power either...

i need an nsv1 motor scratches are ok but no shift or cracks i have plenty of trades and cash. want all cash? no problem, in paypal waiting. 100-180 dollars depending. someone please find me this **** motor. im desperate.