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I also have a 04 Screw FX4 and it did not come w/audiophile. I installed the sub box and the wires were already under the drivers side rear seat, straight in from the seat belt mount about 6 inches in. You also have to change the head unit to an audiophile but the wires will be there also.
Ok, this might be blaphsmy for some of you, but can you take out the sub and leave the other speakers without sounding bad? I'm planning on a new SCREW and I don't want the sub box there. I'd rather have the space to stash stuff. I'd also like to get the 2DIN Kenwood in dash DVD. I'm not a big stereo power junkie. I just want half way decent sound. I guess I might have to pull the stock speakers too and just sell the whole kit and buy some aftermarket speakers in stock locations.
Well just so you guys know I do not think you can use the Sub and Amp without the Audiophile head unit also. So unless you are going to buy one of those also you may be wasting your time and money.