If listening to metal. Keep the frequency low and preferably with a single 12 inch sub.For 2 15s in yours you would probably need to toss the back seats. For rock you really dont need em, for rap you would definitely hear the bass and shake the cars beside you. In my first car I had 2 12s in the trunk and it shook. If you want to have bigger boom and save space, you could get 2 custom boxes made at most probably 10" at most to have put under the back seats so you can still keep the seats in. The boxes custom will probably cost 200 or so and you could get 2 decent 10s for under $100. Kicker is a good brand. You can go to a local shop and tell them what you want and get some ideas too, just shop around, some shops around here are much more expensive than others.
Single 12 inch Jensen sub with a good amp.Alright well I do want the back seat still in. What would my options be now. I do want bigger boom and save space. Would my amp be able to do a dual 10 in sub plus some of those 8 in ones you showed under the front seats.
I'm primarily a metal man but I also enjoy classical, Some rap and Johnny CashYeah I listen to some metal not much but some. Will one 12 bang louder than 2 10s?