Hey guys. Havent posted here in years. But i have a question I thought one of you could answer. Ive bought my 2007 GXP new and Im finally ready to upgrade the stereo. Nowhere does it say it has the Monsoon system, but it has a sub behind the passenger seat. The directions to replace the standard stereo doesnt mention anything about a sub or amp a sub. Is my system a fluke? Non-monsoon and non-standard? Does it wire up the same as the monsoon? Im looking at Crutchfield and they send all the required harnesses and such I need, but I have to know what I have. Any help I can get will be appreciated.