I'm looking for a quality audio connector that will work well for my S4 and my '03 CL. Generally speaking I'm not looking to spend much. I probably don't need to go to an Acura forum for this question but I figured there may be particular devices that work better in these vehicles. Thanks for any suggestions.

 

There is an audio section that this should be moved to. A phone's interface doesn't matter which phone it is, it has 2 primary goals, to have it's music played over your car's speakers, and to get a charge while doing that. There are 2 ways to do this, through a direct connection through your phones headphone jack, or through bluetooth. I simply use an FM modulator with a 1/8" jack input to play my phones music through an FM modulator, it's cheap, dirty and easy. You should be able to do a search and find multiple FM modulators that will work great, and be cheap too...