I've been getting some conflicting reports about modifications. I'm not overly impressed with the system in the Bullitt, and would like to beef it up a bit(not competition grade, just for my personal enjoyment) I have 2 12" Sony Xplodes, a Sony amp to drive them, I also have a Direct x-over EQ that I would like to use, I don't feel the Mach 460 has near enough freq separation, or tunability. Just Bass and Treble?!?!? in this day of awsome factory systems? The stock system in my Durango could lay waste to the Bullitt "radio". Anyway, I've been to a few shops around town, one said that the subs will not work well, and the EQ not at all. Shop 2 said subs will work, you just have to know where to tap into the system, EQ will not work. Shop 3 had never heard of the Mach 460, but is sure that if he installed it, it would work fine, after all, it is only electrical pulses to a se of speakers. Does any one know for sure?