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Lenny posted a topic in Ford Focus Guidesive done some research on the internet prior to choosing the correct brand of replacment induction filter, most would assume that the best choice to be K&N but i have found Green Cotton Air filter to have the edge over K&N or PiperCross due to Green's manufacturing process being more hands on instead of automated manufacturing. the green filter in bonded with precision to the frame of the filter the results are more air flow in to the filter where K&N use an automated process resulting in over use of bonding glue to the frame of the filter which can spread across the panel restricting flow and performance of the filter leaving is performing less than K&N's original prototype that they use to get their gains figures from. but anyways enough of me blabbing on about the differences, because the information is available on other websites for all to view without me re-typing it lol. to purchase a Green Cotton performance induction filter for your ford and feel the difference for yourself log on to http://www.priracing....php/144/1/ford and get 10% Discount off your Green Cotton Performance filter by using the code FORDOWNERSCLUB10 you can also get 20% Discount off any Ritchbrook branded stock by entering Discount Code: RICHBROOK20 both offers are eclusive to members of fordownersclub.com special thanks to Ross at Priracing for this kind offer. So here's whats in the box for the focus 1.6TDCi induction filter. Ive decided to upgrade the standard ford induction filter in my 1.6TDCi focus to a free flowing high performance induction filter. and since i was changing it ive decided to create this guide to show others what is envolved aswell as report on the performance difference between the stock and aftermarket direct replacment air box filter. fitting time takes around 15-20 minutes, Tools required are an 8mm socket and a pair of rubber latex gloves So Open the bonnet, remove the battery cover if fitted. and using the 8MM socket loosen the 4 bolts that are holding the lid of the induction box in place. please note the bolts do not pull free/seperate from the lid, they remove from the bottom section but stay inside the lid section by design, Once lid has been removed you will see your heavy stock ford filter, hopfully ford wont have bent your stock filter when putting it in their as they have done with mine. place your hand on the top end of the filter and pull upwards to remove it. once removed, ensure the lid from the induction box aswell as the 8mm socket are stored off of the engine bay and close the bonnet if you are planning to wait a couple of minutes prior to fitting the new filter. this will help prevent any contamination getting in to the induction pipes.