Port is too small.......... can't usually throw a sub into any ole box. The box has to fit the tech specs of the sub to work optimally. Funny thing that. Many times I've been able to build setups for people that kill installs with better gear that cost a sh-tload more money because of this fact. It's amazing how good you can make a basic sub sound if you follow the specs (box size and sub power requirements).
If you go online to Infinity's web page, you should be able to get the box sizing........ or even call their customer sevice.......... assuming they have such an animal.
Current : 2013 Mini Countryman JCW
Past: '88 E30 M3, '69 BMW 2002 Ti, 2000 328i, Audi A6 TT, BMW X5 3.0i , Audi A4, Mini Cooper Clubman S 1.8T