2013 Civic SI vs. 2006 Civic Si

I was wondering the main noticable differences between the 06 and the 13 Si aside from appearance. I previously had an 06 Si with 165k miles. It was old and I'm pretty sure the previous owners had really gone in on it and abused it a good bit. Regardless, I loved the car and wanted to know if the 13, being that it's newer, was any slower or how it compares to the 06-07 performance wise. I was also curious if the the 13 was the same as far as being able to modify it and if there was a good range of after market parts. I'm really mainly concerned about speed and performance since I already know civics are quality and will last a while. Thank you!