04 Silverado Crew ,installing A Second Amp?

[cooker]

Hey everyone i have searched and couldn't find anything so here it goes ,just installed a 8 inch l7 with mtx amp, i have the factory bose system, so i installed a loc under the main console, tapped into just after the factory amp. Now i want to add a second amp to run my PG componant system in all 4 doors, now i need to know can i use the speaker wires coming from the factory amp to run to my second amp and will everything run ok or do i need to run all new wires from my new amp to all the doors

Thanx

Craig