I'm contemplating the purchase of a 2016 Civic EX-T because I can't justify the added cost of the Touring. However, I find the sound system to be a bit weak in the EX-T trim. Is the system pre-wired for a subwoofer that it can be added and/or can the default speakers be easily replaced with more powerful speakers to get better sound? I don't want to buy a new car and mod it with a bunch of non-factory components and aftermarket wires, but I also don't want to settle for the EX-T's factory sound. The car is too new for me to be able to research these things online and I don't trust a salesperson to know enough.