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I need to install an amp.
And I was wondering if someone can write a DIY for a Sedan
what to do step by step for 03 Sedan

i know that i have center storage. the DIY for the 2dr, is the older type.

and will a 4Gauge power cable fit under the modlings?

 
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the diy should be identical, as to fitting under the mouldings, heh, would you like to look under both sides of mine? 0 gauge, 3 remote wires, and a wire for a remote gain... other side, 3 sets of rca cables

 
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Ludlam beat me to it, but I have a good suggestion to: Rip apart your car. Install fatmat on doors, floors, and trunk. Run 0 gauge from a new Optima Yellowtop under the hood to the trunk into a disty block. Run 16 gauge (or higher) speaker wire (2 for components) per speaker, to the speakers, from wherever your amps goin (Better be in your trunk, cuz under the seats is g-h-etto). Make a nice ground wire in the trunk, into another disty wire. Run a big remote wire to the trunk (16 gauge) into a disty block (yeah, i know thats a lot, but it helps A LOT for expansion). Run 4 pair of RCA to your trunk, from your HU (1 pair for sub, 2 pair for cabin speakers, 1 pair for AUX [just in case]). Reassemble. Wham bam thankya ma'am. Good car.