I have an 08 MS3 sport non navi. And i'm starting to piece together items for a sound system upgrade. I discouvered that the Bose option for them comes with a sub that is under the passenger seat. If I buy one, will it fit under my non bose car? I'm assumeing it will, but I wanna make sure before I locate and buy one. Of course it wont be my only sub, I have a 10' for the trunk, but this could help make it sound good with this side sub up front. Thoughts?