This air inlet pipe from FTP-Motorsport is the best bang for the buck upgrade! This item is a perfect fit for the N55!
It's a direct replacement for the factory plastic pipe, this one is completely aluminium with a Vitron O ring. This FTP version has an increased diameter for more airflow, and more airflow = more power!
For all FTP-Motorsport products that are not in stock, customs duty is likely to be paid on top of the advertised purchase price.