I purchased the Orranje Stealth Airbox for my R53 Mini, I was very happy with the quality of its construction and how easy it was to fit (following the clear instructions provided by email). There is a noticeable improvement in throttle response, especially in the lower rev range and a louder sound from the supercharger (not unpleasantly so, but enough to make a noticeable, positive change). Also, big thanks to Orranje for upgrading my purchase to the V2 at no additional cost. It was a lovely surprise when I opened the box. Highly recommend, will shop here again.