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relatively new lexus owner. i have the base model. i was told by my local lexus dealer that there is not a mark levinson upgrade available for my model. i'm leery about upgrading the stereo with something aftermarket due to it being integrated with heating/cooling, navigation, etc... i'm assuming the safest bet would be to simply replace the speakers, but i'm plenty of years removed from knowing anything about car audio, esp with the integrated systems. any recommendations about how to improve sound quality for my lexus would be appreciated. i owned an acura rl prior to my gs350 and the sound quality with the acura bose system sounded vastly superior even for an older model. i'm just trying to do a cost effective upgrade with my lexus. thank you in advance.