I'm looking at getting some subs for my truck and I had a few questions for anybody that knows about wiring and what not. If I just hook up the subs without a new amp, will it work with the factory unit? Or what if I do put in a new amp, will the factory speakers survive? I'm not sure how many ohms they are but I'm guessing 2 and the new amp would be for 4 ohms right? Any help? Or recommendations for the subs? I'm border-line clueless. lol