When I first attempted to change the stock filter to a K&N repalcement, I broke the lower tab/insert portion of the filter housing and receiver assembly (airbox) trying to remove the filter by merely unlatching the front half of the airbox. One hundred and ninty dollars (and a new airbox AND MAF...Ford doesn't just sell the airbox assembly
) later I learned to loosen the hose clamp on the MAF at the plenum (rubber bellows/accordion looking thing)and gently remove the whole airbox without unlatching the two halves. Once removed, unlatch the two halves and change out the filter. Look at the lower portion of the airbox halves and you will see the cheap tab/insert set-up I am talking about. :rolleyes:
I have included a diagram to clarify...
http://www.contour.org/mods/howto/img/SVT-intake-parts.jpg I hope this helps...welcome to the site!!
Art