Ok, i reviewed what crutchfield sells... the adapter I was thinking of is for older hondas and acuras. The one they show for the RSX is basically a LOC though. An easy and cheap solution, go to walmart and pick up a Scosche line output converter and the 98-up honda/acura harness. Strip the speaker wires of the plug-in harness for the car and your new deck harness... using the directions with the Scosche adapter, match up the correct wires on the input and output sides then set the switch on the unit to "factory amp". Connect your power and ground wires for the deck as well and plug it all it... with the deck still out of the dash, power it up and set the controls on the scosche unit to get the best volume. Its very easy.