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With your license plate blocking off little more than half of the air flow to your FMIC, I'm sure you took off the air box lid because your car need's all the help it can get when there's a huge block in front of the breather system.
I suggest you find a new mounting position for the Plate.
I'm quite sure I don't know what you are speaking of???
 

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That sucks you guys paid over $100. There were a dozen of these threads months ago. It comes as the whole airbox with lid and filter - but all you need to use is the top lid, the box itself is the same as the ST.

Ford OEM Part # G1FZ-9600-A | FREE SHIPPING* -Sunrise Ford Parts
I tried to order one of these on 9/2 for $48.90. After the weekend they sent me an email saying the new price was $66+ and that it had increased on 9/1. Needless to say, they wouldn't match the price on their website, so I canceled the order.
 

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I tried to order one of these on 9/2 for $48.90. After the weekend they sent me an email saying the new price was $66+ and that it had increased on 9/1. Needless to say, they wouldn't match the price on their website, so I canceled the order.
Ahh I see. My dealership pricematched, and I had a $10 reward for parts from when I bought the car. That was a lucky deal!
 

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I agree! You'll get way more turbo blow off noises way. I had it like that until I sold the ST. Paired with a K&N filter the intake was really loud! With the RS box cover you'll only here the suction of air, which sounds cool under WOT but I hear no BOV noises at all in the RS with the stock box because it seals to the hood. You can definitely hear it with the hood open tho.
Actually the RS box seals to the hood liner...take out the hood liner on your RS and that great sound returns! :wink:
 

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Actually the RS box seals to the hood liner...take out the hood liner on your RS and that great sound returns! :wink:
That's true! Less hassle if I just remove the box top though. Needs more exhaust noise!! But my bank account disagrees haha.
 

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I just dropped in a green filter in my stock box and I get plenty of sound from the intake. I'm only able to hear the turbo if I have the hood open though.
Second this. I bought a Green Filter (chose it because it was open ended, unlike the K&N or Spectra), installed it without the top of the stock box, and my noise basically doubled. Can't hear the whistle that well, but the intake "whoosh" and the BOV are extremely apparent now, even under medium throttle. Don't really know if it gave me any WHP, but a washable filter is still cheaper in the long run than stock, and the BOV is like music to my ears. Best $50 I've spent on this car so far.
 

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That's true! Less hassle if I just remove the box top though. Needs more exhaust noise!! But my bank account disagrees haha.
Yeah, it absolutely needs moar grumble out the back. I went with the MBRP SS Catback on my RS for the same reason, great low rumble and $540 shipped...bank account approved!
 

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the K&N I have has an open end, it comes with a plug that you can cap off the end if you would like.

https://www.amazon.com/dp/B00CR9WY38/ref=psdc_15727081_t5_B001C4SLOU
I didn't see that a year ago when I bought my filter, but I'm glad they came out with the design. Maybe I just wasn't looking hard enough. Either way, the Green Filter was $20 less and seems to have more surface area on the interior cone than the k&n, so I'm still happy with my purchase

MainlyMustangs said:
Its strange, I have the same set up and I see where lots of people are talking about doing it for more induction noises, but mine sounds the same...do people dream up these new noises with an RS airbox and K&N because I just don't hear it (luckily because I want my modified car to sound and appear to be stock to everyone else). By the way, I changed mine for a bit better airflow, not for any sounds.
I don't know if it would've sounded the same if I put the top of my box back on, but I've had open elements for years, so I didn't see a reason to have the top of the airbox back on. Also, sure it increases airflow, but I'm not going to pretend I gained 5hp from an air filter. I'm just glad I have a re-usable filter that also gives me a decent sound.
 
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