id use the speed wire if u were around me id give u what i have from my last car i think its 17ft maybe a few feet shorter. i like speed wire but for me since im running active i need two wires for each front door and two wires to each rear door for rear fill i need the flexibility of running wire in different directions. u can just tap the wire to the adapter plug that you buy to put the radio in with , cap the radio side and run everything through the speed wire. ive done this many times with upwards to 350w a channel from a rockford t1000-4ad and never had problems but i personally like to run separate wires