I have the Scion unit in my 04 Celica. It is leaps and bounds better than any other stock Toyota unit. You have to search google for some of the hidden features of it. When I installed it, the sound was garbage. I found that if you hold down the SSP button you can choose car type (xA, xB, tC) all of which have their own very distinct sound. I have found that the xB has the best sound.