I have an 05 Silverado crew cab with factory Bose premium and OnStar. I installed a new head unit but forgot to turn down the chimes on the adapter box so the speakers are now blown and in need of replacement. The factory speakers are 2 ohm but the only replacements I can afford are 4 ohm. Will installing these hurt anything. I realize that the volume will not go as loud but would they still sound good? Is there a cheap way to replace the factory amp if that won't work?