I just bought an amp and the guy said I needed all this extra stuff to install it. I thought you could just take the speaker wire and attach them to the corresponding channel. And for the power wire, he said I have to have a new one installed from the battery, can't I just use all the wires from the factory amp? Everything is there that I need. Is he trying to rip me off. Whats a typical installation like, I thought I didn't have to modify anything. I need help. Thanks.