Maybe a down firing enclosure like this one? Lots of finishing/blending with the interior options, and you'll get some boundary loading to boost output.
Hey folks, I was recently lucky enough to land my dream car: a Guards Red 991.2 GT3 in manual. Though this car will live half its life on the track, the other half will be lived on the street. So, of course my mind went towards the audio system. I had met Vanguard's Nick Apicella and Matt Kim...