Well I picked up an 05 Magnum and it had the factory Boston Acoustics system in it so it has 6x9s in front doors, 6x9s in far rear and 3.5" in-dash, I currently installed an IVA-W205, 4 Alpine SPR-69LP, 3.5" Stock Bostons all running off of the deck, it sounds ok, but when I turn it up loud it distorts and I like to crank it with the windows down, I plan on putting some 10" subs in the back so bass really isnt an issue with the speakers, just want to be able to turn em up LOUD so I was thinking about getting an MRP-F250 (40x4RMS) or MRP-F450 (70x4RMS might be too much) and running the front door 6x9s and a new set of 3.5" dash speakers off the amp and leave the rears hooked up to the deck....Someone told me that the alpine sps-69c3s would be better for me because the are a 3-way and will be richer and louder, What do u guys think?