What speakers are adding under front seats? I have ripped out the stock speakers (tweeters and speakers in doors). Replaced them with Focal KRS3. Fired them with audison 4-channel amp via a JBL MX-8 SP. Sounded alot better. But since it is configured in 2-way only, the bass and mid is not very coherent. I intend to add another 2-way amp and rip out the front seat stock speakers. Not sure what speakers will fit well in there. Will need at least a decent amp to fire the midbass too. If you are intending to get a set..go for a 3-way.