i have a 1999 hondar crv.........the part in between the muffler and the catalyc converter, is it called the resonator?......a friend told me it was........well it seems that the baffle inside has come loose and is rattling......is it expensive to replace at midas or another suggestion?

 

Aloha and Welcome the forum. The pipe between the muffler and Cat is called pipe b exhaust. it costs 159.33 per Majestichonda.com.
Call several muffler shops and get a quote for the pipe b exhaust, and have a quote on the cat just incase it too is no good.
Some shops sell the cat at 35.00 Honda wants 545.11 for the Honda OEM. This is also a good time to go to a Larger exhaust pipe. They may try to sell you a muffler also. 8 yr muffler, suggest the change to a flow through exhaust, sounds nice, but louder than stock. or stay stock w/after market muffler.