Which Dampener are you guys using?

My CAT fluid style damper is SFI rated, not even advertise , but the sticker and spec sheet was right in the box, but the thing is huge and takes a 3.5 inch bolt that you need to source elsewhere (3/4-16X3.5 grade 5 or 8, $8 at a good hardware store). I have it more for the chrome theme of my cruiser motor. I have a "pro-race" damper that comes with a removeable weight for a 360 or a 318, Summit sells them as thier own but its made by Pro-race.com, called pro-street. Looks nice but its not SFI and is not recommended for over 6000RPM.