Hi i just thought i would share my experiences with a NGR Type-s BOV.
it is identical to a Greddy Type-s except without the leaking due to a better designed diaphragm.
now i currently have this installed on my FD and it is a great product, sounds great, and is even pretty cheap
i dont have any videos yet due to a crappy camera but i do have some pics, i may have a video later this week (ignore how i have my flange setup)
here is their youtube channel, i know it mostly DSMs but it sounds the same on my FD