I had a Polk 660 amp installed under the drivers seat yesterday. So now I have Polk 6.5 in the doors and the original dash spearkers. No sub. But it sounds really clean. I like the Polk sound and had a system in my house using Polk speakers and a Harmon amp. I still have the OEM head unit and will change that out maybe befor the end of the year if i see anything that looks good by then.