i'm in the market looking for a really nice sounding blow off valve for my comptech s/c boosting 10psi and came to a conclusion that the greddy type s is a good choice. do you know which one i have to buy? the universal one? is it also hard to install for the comptech kit for making the flange? if anyone else heard it on a comptech s/c or know of any other brands that has the high whistle yet intimidating sound please let me know.

 

PM Silver S2K4. He had a custom flange made and installed the Greddy type S (I'm pretty sure that's the one). I don't know how much boost he runs though.