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Old Yesterday, 08:20 AM   #1
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Air Intake Question

Ok, so...I'm not new to performance mods and such although I am new to the Focus Forum and Focus mods performance mods. Been following many threads on various mods that I am interested in and have done but I think I need help to figure "this" one out. I see the cost benefits for doing a Drop-in free flow air filter (Green evidently) and the intake "flap delete" (or whatever it's called), but my question is this...after looking at the OEM air filter box housing, what would be the issue if you were to install the "green" drop in and do the flap delete, THEN not re-installing the OEM air box cover??? In other words, making the top of the factory air box completely open and uncovered as to mimic a CAI??? I don't seem to see any issues as far as a bad seal that may allow dirty air or particles that may sneak past the filter into the "engine" combustion area. I can't see any way moisture/water would affect anything more than what a true open CAI would. And looking at it further still, if you were to secure the filter at the neck and on the right side with a small, rubber hold-down strap to keep the filter locked in place, where is there an issue fabricating the OEM box making it a homemade "CAI"??? I tried it last night and drove home (about 20 miles) and that deep, throaty sound is definitely there, not sure on gas mileage or throttle response yet (don't want to jump on the Placebo-effect right away). PLEASE tell me if I am completely missing something here or overlooking something obvious (and I probably am) but I'm just not seeing it yet if I am. I would greatly appreciate any feedback here and thanks to you all for reading this lengthy and possibly completely idiotic question...Lmao.


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Old Yesterday, 08:43 AM   #2
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Lots of people end up running the open filter.
Lots of other people will tell you not to due to engine heat soaking in.(I have never seen facts proving this.)

What ive seen most people do, is run the lidless box, until they get tired of the sound, (and it does get to be a lot sometimes), then they put it back on.

My way of getting the sound, getting the least(unproven) heat soaking, is to cut the top from the box. That way I still have a lid, but I've still got the sound, and a less area for the imaginable heat from the engine.
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Old Yesterday, 09:59 AM   #3
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I think the best way is to do the snorkel delete, leave the top lid on, and get a closed ended drop-in, or an open ended drop-in, or both.
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Old Yesterday, 11:12 AM   #4
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I kind of figured it couldn't have been just as easy as removing the lid from the OEM air box and having a $250 (plus) CAI created. SOMEONE has to make money SOMEHOW I guess. And, good point about the excessive "growl" from the open lid. It sounds cool for now, however I am quite sure that an extended trip may be a little irritating with noise. Does cutting the air box lid "regulate" the amount of growl that would be allowed to be heard in the cabin??? Thx for responding....
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Old Yesterday, 11:25 AM   #5
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It does lessen is significantly. I have decently loud exhaust, and you can still tell when I'm at full throttle, but that's to be expected. What I have now, is essentially the roush cover, as I plan on putting weather stripping around the top, and making it sit flush with the hood. I'd take some pictures, but it isn't in the prettiest of states right now.
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Old Yesterday, 12:29 PM   #6
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When you get a open ended filter it will be loud, trust me. The factory air box is a cold air set up how it is, so removing the lid is just going to let in hot air. For power is run a closed end drop in filter and do a snorkel delete.
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Green Filters drop in-Snorkel Delete-Steeda RSB-Fswerks RMM insert-Focus Power Tune.
Build thread-http://www.focusfanatics.com/forum/showthread.php?t=382642
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Old Yesterday, 12:31 PM   #7
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I would be interested in seeing the size of the opening that you created into your OEM lid. Considering the condition your lid is in (lol), would I get a pretty good idea by looking on the Roush website for a similar/same year and set-up as the 2012-14 Focus SE 2.0 lid??? Thx again...
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Old Yesterday, 12:37 PM   #8
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Ahaha I just haven't repainted the lid yet is all, so you can see my cuts very well. And yes. All the roush intake is, is a new lid with a seal around it.
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Old Yesterday, 12:42 PM   #9
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Quote:
Originally Posted by Jburks View Post
When you get a open ended filter it will be loud, trust me. The factory air box is a cold air set up how it is, so removing the lid is just going to let in hot air. For power is run a closed end drop in filter and do a snorkel delete.
Yeah, I guess my misunderstanding of this whole "stock CAI" set-up vs. a K&N (or whatever) CAI is that the air filter on both accounts is mostly fully exposed in the engine bay just maybe at a slightly different angle/position. However, the drop-in with snorkel delete appears effective enough with amount of air allowed to be sucked into the intake. Regardless, any aftermarket CAI pushing the $250 envelope versus a little creative ingenuity for 1/4 the price is a winner in my book. I guess it's all about justification one way or the other...
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Old Yesterday, 01:52 PM   #10
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I have to say my fswerks heatshield has been keeping my intake area cooler. (I also did snorkel delete) After driving 100 or so miles I popped the hood and the intake and heatshield was much cooler than the rest of the engine
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