Carbon Fiber isnt quite outdated yet, go for it. As far as giving it a race spec look, new wheels would be nice, something light. I just ordered a set from buywheelstoday.com you may want to browse through some different brand there and see what you like. There are also all-out lightweight racing wheels like Gram Lights or Spoons, but they tend to get pretty expensive. For the rest of exterior, subtle things would be your best bet. A slightly different front lip and side skirts will give it a nice look thats not extremely flashy. Carbon Fiber hoods are always fun. I don't know if the original design of the car was for weight loss or not, but you can drop weight in any car with the above mentioned items. As for interior, Type R accessories look pretty sporty, and still give you a nice clean factory look, but they cost a pretty penny, at least in the US, I'm not sure what the avaiability is like over there. You could get things like a type R steering wheel, Shift knob, shifter/ebrake boot etc. Also, new seats are a definate plus. You can find tons of different racing seats, or you can swap seats from other cars. I've seen Civics with seats from Integras, S2000s, and RSX's. I'm probably forgetting a ton of stuff but if you have anything else specifically in mind, post it up and Im sure we can tell you if it would work or where to get it.