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Originally Posted by OffRoadSonoma
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yes there is a difference. the stock system is ACdelco sound system. its a good system but the Monsoon is actualy the upgraded system as well as bose is another option. i dont think bose was an option though in that year rivera but i know it is for the GTp's, bonnevilles and park avenues. id say as long as the cconnector in back connects properly id definetly go for the monsoon one. its a great brand and depending on the year from the monsoon HU it actualy has a built in AMP either way you need a new CD player and you cant go wrong with monsoon