it all depends what are you looking for.....to be honest the only real reason the monsson systems sounded any bit good because they were a paired system meaning made as one whole system every speak and amp were perfectly tuned.....you will notice a difference with aftermarket speakers as by all means anything is better then the paper crap that comes from the factory, and the whole 5 speaker(surround sound) is totally worthless....i personally have done a full system in my car and love it