you need to keep the airflow meter, most peaople have the std pipework from the turbo to the airflow, and then an after market air filter on a brkt for the s13
http://cgi.ebay.co.uk/91-99-Nissan-2...QQcmdZViewItem
http://cgi.ebay.co.uk/91-99-Nissan-2...QQcmdZViewItem
check through for the uk shippers