The HKS Sequential is a fluttering sound (older model) you probably wont be able to find one brand new so pointless here...
The HKS Super sequential is sharp sounding if you know what i mean... (like an abrupt "chiiiiiiiiink" I had one and it broke in 2 months and it took them 6 months to give me my money back. I'm sure it was a one off faulty item but I liked to change BOVs often so wasn't interested in a replacement I had my fun with it :p
My favourite blow off valve was the ARC one I had if I remember it's about $700 (this was a year or 2 ago) worked well and the quality was beautiful would get one for my next turbo car. This would be my personal recommendation.
turbosmart is not a brand I even looked at or thought about never used their stuff but I've heard "things"
If you go for a reputable brand you should be right just choose what sound you prefer...
but PLEASE don't turn your car into a mini-bus, you know the sound I'm talking about...
I can supply BOVs so if you're interested don't be afraid to PM for more details :)
I'll try get more info and choices for you in the morning.
