[Mirko]

Just be careful when buying used. The older Karbonius boxes weren't that strong/reinforced so the whole airbox would crack at the top from the pressure. The cracks look like clear coat but if you watch youtube videos you can see the box flexing hard in that spot. I looked at a few used ones a while back when I was considered buying one. They did change the design on the newer one to have more trumpets inside to prevent that. Geoff Steel one is better reinforced in that regard but the finished product was a little rougher than karbonius. However, what does that really matter if the box works and looks good (ie. 8/10) instead of 10/10. It's going to get dirty anyways :P

Happy hunting!