Difference in blow off valves, HKS vs. the rest
 

Performance wize i dont know much difference between blow off valves, but with the sound they make i know that HKS has one that sounds differently then others, like with Blitz or GReddy blow off valves its like a loud spray noise but with HKS (the one i really like) it makes a kind of tweeting sound. I was just wondering why this is? so if any one knows or has a comment on it then type away!

wrong section.... (moving to a more appropriate section)

It's just the shape of the air passage I believe. The HKS whistles, most others don't.

Personally, I am not a big fan of the whistle noise, but I know that many people like it.

-Max

what about turboxs :)