Can 2 15" subs fit in a 05 nissan altima?

Google Pwkdesigns
That's all you have to know. You don't need 15s to make Retarted bass. Trust me that's all you need is a box designed by Pete kulicki. He uses math and science to transform your your car, subwoofer, and encloser to an entire subwoofer system. I think it's $50 for the design, but it's worth a thousand.