My first after market dampener was a Fluid Dampener, the second was a BHJ that cracked one of the spokes after limitled use, the next was a non SFI Pioneer, My next SFI dampener was a ATI and is still going strong after 12 years of use. Once Fluid Dampener went bankrupt and I saw all the bad comments on here about them, even if some of the comments may have been B.S., I have bought and used ATI I have two complete ATI aluminum units in the shop now for high dollar, high HP motor builds and one ATI long hub that I will buy one of thier three ring steel outer dampener to use on my next build with a Milidon gear drive BTW, the BHJ I bought and dyno tested was a all aluminum one that replaced a stock 340 dampener on the dyno, 7 lb differences in weight, we saw no measureable differences in HP or torque, maybe that test should have been at the track