You shouldn't. Aftermarket units are much better. But it's your truck, your call.

You read my post, right? I told you, as it connects directly into speaker wires, you do NOT have to pull or swap out OEM headunit. You will still need to run HD power cable, but that's easy to do from red junction box under the hood, and sub OFF wire must be connected to something that has NO 12V to it after key is turned ot off, or it will run continuously and drain battery.