yes you will get better SQ with an aftermarket HU. although im not sure that you will retain the stock amps. wraither will be able to chime in on that.
no on the clarion.
yes on the pioneer.
any reason you want to get a double din HU?
also an aftermarket HU will only sound better if its tuned and installed the right way. if you have things like bass boost, loudness, ect turned on it will sound horrible. it should be faded to the front speakers for a better soundstage, high pass filter set right or the bass will be muddy, ect
no on the clarion.
yes on the pioneer.
any reason you want to get a double din HU?
also an aftermarket HU will only sound better if its tuned and installed the right way. if you have things like bass boost, loudness, ect turned on it will sound horrible. it should be faded to the front speakers for a better soundstage, high pass filter set right or the bass will be muddy, ect