I just finished upgrading the stock head unit to an Alpine iDA-X100M, pretty slick unit. Now Im looking to upgrade the four speakers and looking to see what other Super Sport owners have done with this. Are the stock speakers 6" or 6.5"? and Im guessing this upgrade with require the speakers to be on the outside of the upholstery. After this I was thinking about installing the infinity 6100m tower speaker package since its affortable. Has anyone used this setup?