Skylines are meant to be at the track, not with glo-lamps and washer nozzles.
You can put a sub in there if you want, but your turning your back on it's true heritage. I don't really care honestly. I track mine as often as I can. It's where it belongs, and this is also the place to show the haters/jealous what this car is all about.
For the others saying stupid comments, lets meet @ the track. We can discuss there.
Nice car there fellow skyline driver. Treat it with the respect it deserves.