I think the opinions you'll get would be biased cause people are going to most likely go with what they have. I personally have heard the apexi WS and it was just too quiet; I had the Apexi N1 on my GSR and I loved it. When I was picking up a new exhaust for my teg it was hard because I loved the sound of the HKS hiper exhaust but in the end I still went with the N1.