I purchased this a while ago when I was stage 2, but before I got the chance to install it, my motor went and I ended up going with a complete motor build and a Forge BPV.
This is supposed to change the "woosh" sound of the GFB BOV to a higher pitched "woosh".
GFB part# is 5701.
It has some minor scratches on the outside of the trumpet that were there when I received it.
I would like to get $25 Paypal'd and shipped via USPS.
Here is a video I found on Youtube of how it should sound:
Here are actual pictures of it:
Please keep any questions/inquiries in this thread.