I still don't see why FLUIDAMPER makes the SFI certified unit for the 6.2 and 6.5's? How many people out there with a 6.2/6.5 need a SFI spec unit that is approved for racing? I don't see why they don't make a streetdamper version like they do for small blocks and big blocks. They sell for about half of what a fluidamper does, and the only real difference is they aren't SFI approved. I've asked this question to them on 2 different forums they posted about the 6.2/6.5 damper on, and they never responded either time. It would just make some sense for them to do this as many people who have 6.2/6.5's just can't justify a $500 part for a truck that is probably only worth $3-4K. They would sell ALOT more of them if they would drop the price down tp say $350 and not go through the trouble of having them SFI approved.