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NB Randall cowl intake duct

Carbon Fiber Randall Cowl Intake Duct
NB Randall cowl intake duct
Cowl induction for your Miata. Inexpensive, effective and made of carbon fibre! CARB legal.

Made in the USA

Exclusive to Flyin' Miata

Availability: In stock



CARB approved for use in California. EO D-601-1

This is a really cool product. Get it? "Cool". Ha!


Anyhow...the Randall intake replaces the snorkel from your stock airbox with a carbon fibre tube that gets cool air from the high pressure area in front of the windshield. Cold air is dense air, which means more power for you. Most intakes are dyno tested with the hood open, so they perform at their best. As soon as you close the hood, the intake temperature shoots up and all the power gains go away. Not the Randall - in our testing, we saw a solid 5 hp gain with the hood closed. You'll also get a bit more intake growl under load.

Installation involves cutting a hole in the flange at the top of your windshield, above the firewall. This may not be allowed in some race classes, so do your homework. 1.5" holesaw required, not included.
Fits all NBs. Works with factory/FM shock tower braces or cruise control, but does not fit with both. Some minor modifications are required to make it work with cruise control, and you will need our cruise control relocation bracket. Does not work with right hand drive.

Please note that these are a hand-laid product made in small quantities. There may be some small bubbles or imperfections in the epoxy, but nothing that will affect function.

Dyno proof! These runs were done on the same car back to back. The blue run is the bone stock car with the hood closed and the usual fan blowing in the nose.  Red is the exact same situation, only with the Randall installed. The green dyno was us goofing around, we held a fan near the base of the windshield to simulate a "ram air" effect. As you can see, even without the handheld fan it's a very worthwhile upgrade.

Additional Information

Additional Information

Part number 05-28000
Fits: 1999, 2000, 2001, 2002, 2003, 2004 (non-MSM), 2005 (non-MSM)
Manufacturer No
Flyin' Miata exclusive Yes
Fits Exocet? No
Proposition 65 Warning: Cancer and reproductive harm
California emissions Emissions legal in California

Customer Reviews 4 item(s)

Lowered intake temperatures significantly, added slight amount of power at all RPMs
It was definitely worth cutting the hole in my firewall, now I can run 87 and not get any pre-ignition. With my previous K&N Typhoon Hot Air Intake, I had severe pinging with 87 gas and had to use 93. The difference in performance is noticeable when compared to my old intake, which was so close to the exhaust manifold it was losing me power at all RPMs
Review by Trev / (Posted on 7/31/2018)
Results are suspect
While I have no doubt that you had increased power when the car wasn't moving, I question that there would be any kind of power increasing at speeds in excess of 70 MPH. The cowl area is a low pressure area. There is no "RAM" air there. The pressure will be lower and not higher. Put a pressure gauge there and see what happens.
Review by Sam / (Posted on 5/20/2017)
Worth it!
Got this for my NB2, once you make the cut the install is easy, I recommend drilling a hole through the top of the cowl into the intake where it attaches before you put the rubber seal back on and installing a set screw, helps keep it from sliding out of place from where you make the hole.

Love the gains, love the look. Really adds something to the engine bay, for the price it's a great buy over a cold air intake.
Review by Jett B / (Posted on 1/23/2017)
Love the look and performance
After much debate and even trial and error (DDM Stage 1 Intake installed, then removed), I decided to purchase and install the Randall Cowl Intake from Flyin Miata on my 2002. I love the way it looks and it was the only intake I could find with real dyno supporting info.

For me, installation was a bit difficult as you have to cut a hole into the engine bay area. Measure 10 times, cut once. When I got over that part, install was easy.
Review by Mike H / (Posted on 1/22/2016)
Instructions for this part are not currently available online.