Greddy Type-S (no whistling)

Here's my Greddy Type-S and playing with it at low Boost and high Boost.

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Greddy Type-S BOV
I traded my HKS SSQ BOV for a Greddy Type-S.

greddy type s black
blow off greddy type s black edition version 1990th on daihatsu jbjl engine.

Mitsubishi Evolution 8 MR Greddy Type-S BOV
just revving up in my garage in a boring day. it would sound louder if the hood was popped. car is sold already, and i miss it so much.

What bov is this?