I don't see the problem here, why get all wrapped around the axle about stereo/no stereo. The is a simple solution. Buy another Porsche! That way the track car can have the primal auditory delights (flat six engine, or okay, maybe one of those other engines) and your Porsche that is primarily street driven can have the audiophile set up. The added weight can even bee a bonus, a credible reason for justifying more power.