is this the best mod you can make to the airbox? I found these on ebay is this the bit everyone is meaning and also I tried the link to the instructions to cut out my airbox but the link doesnt work anymore. http://cgi.ebay.com.au/FORD-BA-BF-F6-typhoon-secondary-air-intake-snorkle_W0QQitemZ350296134177QQcmdZViewItemQQptZAU_Car_Parts_Accessories?hash=item518f46d221