I have had good sevice from ATI and Fluidamper. I tried one BHJ damper on a fairly mild 500+ hp 440 and it slipped the outer ring after about 6 months of use. No more BHJ for me.
Only bad thing about ATI is you better spray it w/ clear coat before you put it on. Otherwise you'll barely be able to read the timing marks after a year or so.
Maybe where you live but not in Cally.............lol I went from a Fluidamper to an ATI and the later is glass smooth compared to some harmonics from the fd..............
