I replaced mine with a 6.5" aftermarket, and I'm happy with it. That being said, I do not have an aftermarket amp installed. I have considered doing that - have you guys just put the amp under the driver's seat?
jncodudez - there is a GREAT step-by-step write up somewhere on the forum that I used. I tried to search for it, but I can't find it. If you did some digging, I'm sure you'll get to it. It's not very difficult. If you have a dremel tool, you're set once you get into the actual speaker "pocket/sleeve".