I'm sure it does but isn't the air under the car a low pressure zone and the front grille is a high pressure zone. Won't that cause it to not work as well?

There's less air under the car than right in front, but its still going to get a lot of airflow. It won't be as effective as cutting ducts into the bumper, but its a hell of a lot less invasive.

Yeah that's what I was thinking. Now I have a problem I was looking online and there seems to be no suppliers for the exact NACA duct I need in the US like the one bought above^^

Basically I need to find a NACA duct that the outlet is low and not deep and has a 2" outlet for my stillen hose.

Post #22 has a link to plenty that would work. Just buy one of the 3" to 2" reducers. It's on the same page.

^ That was my post. Since then, I've compared OP's vs the ones in the link, not the same dimension. The ones I posted are taller, and I don't know if clearance will be an issue. The ones OP uses are way more expensive and not from US.

I did PM'd OP a while back to see, from his memory, if the ones I posted would fit. Have not gotten a response.

Depending on where you put them, the height may not be an issue. I'm sure some other race parts site has one that fits better, but going from memory yours should work. I'd try it before I spent the coin on the OP's. Whats £45 each translate to in USD? About $80-85 each before shipping?

About 1 GBP to 1.53 USD, so about $69.

http://www.racerpartswholesale.com/category/Naca_Ducts2

Found it on a different site. Not the same dimensions as OP but u can get both with extensions for 60 plus shipping.

^same as the link in post #22. Using the small one, I'll need a little over 4 inches bertical clearance (vs the ones OP posted, much flatter design like you stated).

I may just order those and give it a try. Worst comes to worst I'll bite the bullet.

Hmm yeah I am about to pull the trigger on it but then I noticed this..

Attachment 73268

The bottom side of the amuse bumper is curved and you need 11" of area to mount to I'm not sure if it being curved will work or not.

How long is the flat part in the middle? 11" doesn't sound quite right. Most of the ducts I saw were in the 8-9" range if my memory is correct. It may make hose routing a little interesting, but I would think it would work.

Idk I am trying to figure this out before my bumper gets here by the end of this week. Maybe someone with an amuse kit can chime in and measure it for me

Well I purchased the NACA ducts should be here today and will attempt to make this work!

I decided to go with the revotec 4" (102mm) circular air inlets connecting to the Stillen brake cooling kit (like the yellow Nismo pictured in a previous post). The inlets were about $50 and the Stillen kit is approx $235. I'll let you know how it goes as well.

Revotec Air Inlets
Revotec Automotive Cooling Specialists

First of all, OP- Great job! I really like what you've done here! We were looking to see what we could do for the Nismos but we do have a lot of customers tell us that they don't want to cut ANYTHING on their car, so we didn't want to have to cut into the undertrays either. With that being said, this is for sure what I would do if I had a Nismo.

This is actually how our kit attaches for the factory fascias. We offer two options, one for the factory fascia (picking up air right where you point to) and the second option is for STILLEN fascias that pick up air from the modular/optional brake cooling ducts. This option can also be used for Nismo's and other fascias.