yesterday while I was disconnecting my battery for the first time I found this clear tube (please disregard the 2 black boxes, I don't know what they are) connected to my positive terminal. It has audiopipe marking on it and I can see a wire going from the tube toward the engine bay. What does that tube do? I suspect it is for sound enhancer or something right?

 

Its a fuse holder for an aftermarket amplifier.

 

so how do these amplifiers work? Can I make any changes to them or they are fully automatic? If yes, I may need to dig them out and see what they are.

 

looks like the previous owner installed an aftermarket amp in the car

 

if you have to ask what a fuse holder is, you should not be making any changes to your car.

 

Is there an amp in the trunk or any wires floating around? If you don't have an aftermarket amp I'd disconnect that cause you might have a live wire floating around the car. At least for now unscrew it and take the fuse out.

 

Thanks guys. I'm new to all these stuff and this car was modified the heck out of it from prev. owners. I'm the forth. It has dvd player, tint, aftermarket alarm and many other things inside it. So I just wanted to make sure what that tube does just to be on the safe side. I'll be looking for the amp now, as I don't see any control knob like the one in the picture.

 

If you don't have aftermarket amps they probably used it to power the DVD player. If you really wanna know, you can unscrew it and pull the fuse out and check if the DVD player turns on.