Maybe, but it replaces the bubblegum soft bushings in the rear diff and subframe outrigger braces. The klunk is from the drivetrain flexing under load (usually in 1st or 2nd) and the subframe brace coming up and smacking the chassis. You will notice it a lot more if put stiffer eng and tranny mounts in, but leave the rear bushings stock.
Turn in concepts sells the parts individually or as a kit with the subframe bolts (unabomber's sexy rearend).
I got the race stiffness bushings and noticed no appreciable increase in NVH.
I highly recommend it for our hawkeyes.