Whats the difference? Blow off valves

[sleepy2lazy]

Generally,
Greddy's are about $175 bucks for the Type RS and the Type R is about $200 bucks.
HKS SSQV is about $225-250 and you'll need the recirculation kit for about $30-50 bucks.
50 mm Tial BOV is about $200.

They no longer make the popular Greddy Type-S.
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And i think the sound that you want, is the Greddy Type-S. The Psssssss