Neither the ST170 nor the SVT snorkel will directly fit the stock airbox. The stock snorkel is round where it fits into the airbox, the ST170 is a square edged triangle sort of shape. There are various "How to's" on the web on fitting the ST170 snorkel to the stock airbox, but most involve cutting the airbox and plugging gaps with gaffa tape, or bending the tube using intense heat and something round to shape it
And the cost of getting an ST170 airbox from Ford is prohibitive ($500-600 mark)
Do a search on "How to fit S170 snorkel" or similar and you'll see what's involved
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Manual 2003 Machine Silver 5 Door LR Focus Zetec. Mods: Ford Racing CNC'd cylinder head milled .040", 3 angle valve grind. Ford Racing Stage II camshafts. Ford Racing cam gears. Ford Racing long tube header. Random Technology hi flow cat. Herrod 2.25" stainless cat-back. Pipercross Viper intake. CFM 65mm throttle body. 2000 ported intake manifold. Herrod Custom SCT tune. Eibach suspension. Quaife ATB diff. Wilwood 13" brakes. Custom ST170 leather interior. www.cardomain.com/ride/2773918
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