pjo, geez, I did not realize it had been so long since I have logged in, sorry. I just had back springs put in, it was approx 800.00. I am glad i did it, I would not have done it, were it not for the $5,000 florida rebate and $1,000 Federal tx credit. I think it does wear out th rear tires faster, so a spring and shock upgrade seems to make sense. Like all of these thing I have done to the Prius, including buying it, I am somwhat of a gadget freak and economic impact be damned.... Hal Semper fi