The Greddy type S. a.k.a. Brains eclipse BOV sound! So far the Greddy S is my favorite for now I still have a few to try out. Video coming soon. The first one was the ebay cheap red one, which I did not like at all. The 2nd one I had on for about three years was the Greedy FV. I was not a big fan of the woosh noise it made.
Meter only measures up to 130 and I am hitting the max dB rating within 6 feet of it.
I did not hook up the lower smaller nipple. This is because after reading up on couple of online oldschool form pages, a few people said " It is not required that you run the second line" or "I have the same BOV I do not use the smaller nipple". Works great.
It took me a while to find a clean looking type-s, but I found one on eBay. I had to clean and polish it some what, but other than that great condition. I did not adjust any of the settings, clean install. Works great.
Sound Measurement for both RZ and HKS
New aloco hwy Greedy S to do a Comparison video at the end.