My only bummer with the bimmer is that I couldn't use an Accuton woofer since they couldn't fit under the seats where they are mounted. I had to settle for Focal for that pairI did to, upgraded to accuton in all of mine
which Porsche u have?
When playing with the DSP on my installer's laptop, he couldn't believe how high the mids could be crossed over without any hint of ringing.