Best Cold Air Intake On A 89 Fox With 75mm Tb

The best cold air intake is the one you build yourself. Online retailers like siliconeintakes.com sell everything you need to make it happen, and you can usually do it for a fraction of the price of what a "kit" costs.
 
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The OEM airbox "IS" cold air and is better than most aftermarket kits when the air-silencer is removed. New plumbing between the stock airbox and the throttle body is all that is necessary until you start moving a LOT more air. More air than what it required for any HCI car that I've ever seen.

If you're going for looks well... that's a different story. I like the ceramic coated Anderson Ford Motorsport stuff and they will support just about anything you can shoehorn beneath the hood of a Fox. Like Nik said though... Pricey.
 
I made mine out of turbo piping from a 7.3 and miscellaneous clamps and couplers from O'reilly's. I really need to make a heat shield, though. So I won't get too much hot air off the fan going into the filter.
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That was before I put the filter and MAF on. The pipe already had PERFECT bends, but sadly I was too lazy to take the inner fender out and actually put the filter in there so I just cut it off short and here's how it looks

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With filter and the couplers I MAY have $30 in it. And IIRC, the filter alone cost like $21 or so.