Found a low mileage 07 Sport which the base RBQ radio. The sound quality of the system sucks compared to my 02 Limited. Opinions on is it the radio or speakers that makes the difference between the two? Staying stock what options are there for upgrading the radio, just the 6 CD changer radio? Not overly interested in doing a lot to this right now other than improving the muffled sound I'm currently getting. If just replacing the speakers with a set out of a Limited will do it or with a junkyard $60 different radio is about where I am at right now. Long term this is for my son so once he starts driving he will likely want something more personal with iphone connectivity so no sense putting the money in it right now.