OFC speaker wires or stock wiring?

Not to break out the dead horse beating stick, as this arguement is made on every forum dealing with audio, but on the subject of interconnects, I have not found there to be no difference. I work for a shop where we deal both AudioQuest and Monster. Between the two cable lines, there are differences in sound. I can't say if one is delivering a better sound, but they are different. I have yet to really do critical listening to compare speaker wires.

haemphyst, it is difficult for salespeople to avoid the brainwashing that some companies do (they call it product training), but some of it actually makes sense, such as better, less absorbant insulators around the conductors of the interconnects, etc.. That being said, I believe in many cases they are as much a status symbol to the people who buy them as anything, as they don't really make any comparisons, they just want them. Some people would never dream of hooking their Mark Levinson gear up to their B&W speakers with zip cord. However, if a customer listens to them and hears the difference, then by no means am I going to tell them they are wrong. Human hearing is a complex thing, perception does play a role in what we hear. I do however think you did hit the nail on the head, especially in a car environment with "point of diminishing returns". There are so many other obsticles to overcome in the car environment, the very minor gains you may acheive would not be worth the $50K + you can spend on cables.

I replaced a set of $20 Stinger RCA's with a set of $170 JL Audio Premium-series interconnects..

I couldn't hear a difference at all in terms of actual sound clarity... but ya know what did disappeer?  A faint alternator whine at high volumes. 

That was worth the money eh?