I'm thinking about running a sealed box vs. ported... and it's good to see it can hit high dB without ports...

 

Keep in mind he uses two 18's though

 

And enough power, and in a wagon (although the car is all plastic).

But on the other hand, my buddy with the celica did a 139.7 with a pair of SVC 12" type R's in a sealed box off of ~750 watts RMS. I've also know of a ~01 saturn coupe doing a 143 with a single JL 13W7 off a JL1000.1.