I am trying to increase the HP of my Xfire without messing with the engine too much. So far I have put on a custom exhaust system and K and N filters. The exhaust system really added a nice sound and some noticable power. I plan on including the Upsolute upgrade within the next week or so (I will have to mail my ECU). I was wondering if anyone knew about the Renntech carbon fiber intake for the SLK 320. It seems rather expensive, but it looks like it adds a little power. Also what kind of stock intake does the Xfire have? Is it cold-air?

Thanks