re: Mortgage refining through HARP program?

We bought in 07 at height of housing market. Rates then were 6 plus percent. The current rates of 4 or less but would have to dump in a ton of cash to get back to 20 percent equity to refi without pmi. This program is supposed to let you refi at current amount owed without pmi. Thus greatly reducing loan note per month and locking in at these current low rates