I previously owned an integra that I modified. I didn't know if I wanted to go down that route again with my FR-S. After a lot of research and weighing out the pros and cons, I decided to just keep it stock. I didn't go to school to be a mechanic or anything related to building cars, so how could I possibly make the car better than what the professionals already delivered?
Here's a good article from Richard Hammond that swayed my decisions.
http://www.topgear.com/uk/richard-ha...uly-2011-07-26