I ran mine behind the glovebox and down the kickpanel then down the floor on the passenger side. Then into the fender/ wheel well through a hole I made in the carpet for the power and ground from the batter also. Seems to work nice. Check my cardomain link for the pictures of my amp rack.
VIP Helen '95 325IS 5sp T-boned
Viva la Victoria '96 328IS 5sp w/ some Dinan
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Crusin w/ an e46 M3 at 145 on the dial and revs to spare. Saftey with a V1