There are lots of intakes out there, but most of them make more noise than power. If you have an open air filter under the hood, especially if you don't have a heat shield, it's going to suck in hot air. Even a heat shield won't help much if it isn't fully enclosed. Hot air is less dense - i.e., it has less oxygen - so it's going to make less power. That open air filter is great for making noise, which can make the car feel stronger, but if it's sucking in hot air it's probably making less power than the stock intake. But what if they have dyno results?! Was that dyno testing done with the hood closed? If not, it's not a valid test.

We solved this problem a long time ago with our Randall cowl induction intake. It reuses the stock intake and air box for simplicity and economy (the stock parts flow great for the power levels here), but it makes it so the air comes from the base of the windshield. The benefit is twofold. First, it sucks in truly cold air, from outside of the engine bay. Second, it's force-fed - the base of the windshield is a high-pressure area, so more speed = more air forced into the engine. This results in a dyno-proven - with the hood closed! - 5 hp, as measured at the wheels. It also adds a bit of intake growl, although it's more subtle than an open filter.

The Randall has been gone for a while - our original supplier retired - but we've brought it back better than ever. It's now silicone, which makes the install dramatically easier than the old rigid tube. It's also about half the price! It's more durable, and we now have a firewall plate to secure the end of the hose. The firewall plate also eases installation (it's ridiculously easy to locate the hole), visually cleans things up, secures your clutch line, and has a simple (and unintrusive, flow-wise) screen to keep the intake from sucking up leaves in the cowl.

Installation involves cutting a hole in the flange at the top of your firewall (the firewall plate is your template, so it's pretty easy). This may not be allowed in some race classes, so do your homework. 1 3/8" (35mm) hole saw required, not included.

While we recommend our Mazdaspeed intake package for Mazdaspeed Miatas, this will fit on MSMs and is an improvement over the stock setup. And is legal for our California friends!

CARB approved (D-601-5) so it's fully legal everywhere in the US. Since it's pre-airbox, it's likely legal everywhere, but check your local rules to be sure.

Fits all NBs with left-hand drive, with no issues with cruise control or shock tower braces, though the cruise control actuator will have to be relocated slightly. Sorry, it doesn't fit with right-hand drive.

Note that if you use this with a cowl washer bottle, like what we sell, the parts will physically fit, but the washer bottle will sit very close to the mouth of the intake. Check out the dyno chart - on our car installing the cowl washer bottle meant the car picked up about 3 hp instead of 5 - so still beneficial over the stock intake, but not as beneficial as the Randall with no obstructions.

Photos shown are sample product. Final production items may vary slightly from what is shown.

NB (1999-05) : Powertrain : Intake

PCV valve grommet

Moroso air/oil separator kit (small body)

NB Randall Cowl Intake V2

Randall intake blockoff plate, NA/NB