I'm installing an alpine amp ro run my alpine components and 2-ways, i'm also planning on changing all my speaker wires on all of my speakers. i'm a little confused on where i should run my power cables. I'm thinking of running it through the b-pillars but kinda unsure if that would have an effect on the curtain airbags, i was going to run it on the driver side under the sills (but i'm gonna be running speaker cables on that side from my amp). Would running the power cable along my speaker wire introduce noise to my system? I have a lancer 08 es without the ss package.

 

i ran mine though the fire wall above the peddles

 

as long as all your wires are shielded and grounded correctly, then you shouldn't have any problems running them next to each other, even though that's not ideal. If the cables you are running are not shielded with a drain wire, then you will probably introduce noise.