Standard box, surprised it fit in the trunk. Just barely slides under the stock speakers in the trunk. The guys suggested I put two 12" subs in the back since I'm pushing 750 RMS, but I just laughed, that's too much weight. I didn't want a 12" in the first place since it's bigger than a 10" but they were sold out. Either way I'm happy with the sound, and it pounds.
The nice thing about these cars is that they don't leak much sound, I can have it cranked up pretty high and hear nothing outside the car. I want to enjoy my music, not share it with other drivers.