if you go on EcuTek - Advanced ECU Technology, i do not see any product that supports the 350Z/G35s
so i dont believe they have a product to reflash your 350Z
I think ECUtek is the device to upload the map, and the map probably come from some other party. I strongly believe all shop with reflash service may have the same or almost-same map, only factor that our club member should consider is PRICE $$$.