07 ZX4 2.0 Airbox Resonator - Focus Fanatics
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Old 02-05-2014, 08:42 AM   #1
FivePointOh
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07 ZX4 2.0 Airbox Resonator

Hello people. I'm trying to find my airbox resonator. I'm reading everywhere that deleting it would give the engine a slightly throatier tone. I'm really interested in doing so but I can't seem to locate the airbox resonator.

Here is what my airbox looks like. I don't really see any resonator there. It's gotta be somewhere in there but I just don't see it. Is it inside that airbox? The owner's manual labels that airbox (cover?) as the resonator.



Many people said that it should be located between the airbox and the fender, but I don't see it here. This seems to be a different setup.



Can anyone help me please?

edit: ok now I don't even think this belongs in the performance section lol.


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Old 02-05-2014, 10:37 AM   #2
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The 05-07 cars came with a lifetime filter. The "resonator" is about the size of your head and I don't think it can be removed without ripping out the whole thing...

You can buy a cold air intake or do a "stealth CAI" mod that uses the factory intake.

(someone correct me if I'm wrong)
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Old 02-05-2014, 10:40 AM   #3
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Aw well that's unfortunate. Yeah a cold air intake is probably something I'll be installing sometime soon. Thanks for the info.
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Old 02-05-2014, 11:14 AM   #4
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Yeah just adding on to what Mac said... That huge air box in front of the battery is AFAIK also the resonator. Under the air box/resonator is the MAF Tube. The Stealth CAI mod adds a cone air filter to the bottom of the MAF tube. I did it and am happy with the results. My 2004 duratec also had the lifetime air filter. If you want to delete the air box and have a CAI, there are a few solutions like this;
http://www.fswerks.com/products/fswe...-focus-duratec

Cheers!
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Old 02-05-2014, 12:37 PM   #5
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Quote:
Originally Posted by Marde View Post
Yeah just adding on to what Mac said... That huge air box in front of the battery is AFAIK also the resonator. Under the air box/resonator is the MAF Tube. The Stealth CAI mod adds a cone air filter to the bottom of the MAF tube. I did it and am happy with the results. My 2004 duratec also had the lifetime air filter. If you want to delete the air box and have a CAI, there are a few solutions like this;
http://www.fswerks.com/products/fswe...-focus-duratec

Cheers!
Definitely some valuable info. Thanks!
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Old 02-05-2014, 01:27 PM   #6
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That big box forward of the battery acts as a resonator. The actual airbox (where the air filter is located) is below the left headlamp, behind the bumper.
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Old 02-05-2014, 08:07 PM   #7
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I too wanted to stick to the stock airbox for a while (at least until I got other mods and a tune) until I realized how much of a cobbled mess the stock unit is. I went ahead and made my own SRI (that looks pretty legit).

When I installed my clear corners the a couple of weeks ago and removed the rest of the unit all the way to the driver's side fender I found out how restrictive it truly was. Especially with that "waffle" piece inside.

Also my "lifetime" filter had all types of dirt and leaves in it (which is fine if there was an easy way to service it and reuse but there isn't) and I just purchased the car and don't touch gravel roads at all so that means my low mileage car accumulated a lot of trash in it in a short amount of time from previous owner use. Long story short I am glad I am using a SRI with a nice cotton washable cone filter now.
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Old 02-13-2014, 06:05 PM   #8
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I did the stealth CAI and it worked great. Don't expect a whole lot of sound difference but some. Def feels more peppy too! Also make sure you use a good air filter if you are doing that not some junk $10 one from Advanced Auto or whatever. If I remember correctly 3.3'' is an exact fit but 3.5" is close enough you can clamp it and make it tight enough. The air dam is HUGE man. It's basically the size of almost the entire front fender. Once you are done taking that out (have to remove the fender liner and loosen the front air splitter) you will be left w/ the stock "box" and like a foot of tube that sticks straight down that your MAF plugs into and your new cone filter will stick right on the end of that. If you have an automatic it's a little more complicate as you will need elbows to go around a coolant line I believe. Your sig didn't say so I wasn't sure

I've had mine on for about a year w/ no issues and even took it off, cleaned it and put it back on w/ no issues. If you are worried about water you can get a pre-filter that might choke air a little but I did it on mine and it worked perfectly and doesn't seem to run any different w/ the pre-screen off. See sig for my choice in air filter if you are curious.

Btw OP do you own a Mustang 5.0 as well? I see your forum name....
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Old 02-13-2014, 06:54 PM   #9
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I would guess the OP was reading about removing the resonator on the '12 + models. That intake is quite a bit different from the '07, hence the confusion.
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Old 02-18-2014, 09:35 AM   #10
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Thanks for all the help guys. :)

@choate: haha I don't, but a man can dream :P

@sailor: I was actually looking at the earlier mk1 Focuses prior to the facelift.
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