is it possible to put a 15 or 18 inch subwoofer in the hatch of a camaro ?

 

Yes, I have run two 15" in a few car's back there, depends alot on the sub and the air volume required

 

Absolutely possible. The real question is why? As a general rule, unless you shell out big bucks for a ver high quality sub and a big *** amp to run it, a 15" or an 18" will sound sloppy on just about anything but rap. They're just too big to recover and respond to fast moving bass in lots of other music. I'd rather see you do multiple 12" subs than a single 15" or 18".

 

15's are pushing it, really bad, and 18's are pretty much competition speakers.