I dare anyone to put this in your Rover:
http://cgi.ebay.com/ebaymotors/Fake-Turbo-Blow-off-Sound-LAND-ROVER-FREELANDER_W0QQitemZ370039783836QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/Fake-Turbo-Blow-off-Sound-LAND-ROVER-FREELANDER_W0QQitemZ370039783836QQcmdZViewItem