How To Install Jenvey ITB’s on a S2000


Officially in the home stretch, Pete built this small, simple bracket out of some aluminum bar to mount the factory MAP sensor in a convenient location that didn’t require modifying the wiring harness, plus it made for a nice short vacuum line to the vacuum manifold.


With the brake booster hose hooked up to the vacuum manifold, all we had left to do was install the main radiator hose, bolt up the velocity stacks and install the air filter.


Because the Jenvey manifold moves the water neck and thermostat housing closer to the firewall, our Mishimoto silicone radiator hose wasn’t quite long enough if we routed it through the support bracket by the driver’s side shock tower. To address this, we spaced the support bracket out using a 3” length of aluminum tubing and a long bolt through it to the factory mounting hole. This brilliant piece of engineering was all me, baby!


Next we put the provided retaining clips on the carbon mounting plate for the air filter.


As you can see here, the two large plastic tabs on the right side of the filter are designed to slide into the two slots on the left side of the carbon plate, creating a hinge that seals the filter on that side while bolts and the three retaining clips seal it on the other side.


With the carbon backing plate sandwiched between the ITBs and velocity stacks, it was just a matter of installing the filter and we’d be ready to make some noise.


As you can see, the filter is rather large for the S2000’s engine bay, especially back by the firewall where it’s up against a heater hose. Still, the hood closes without issue, and we figure the more filter area the more clean air the engine will be able to suck in. We are concerned about it breathing in hot engine bay air, though, so we plan to buy or build a carbon airbox that we can connect to our AEM cold-air intake.

One of these relatively compact Jenvey LS carbon airboxes might be a good starting point for an airbox for our S2k.

Jenvey makes a number of different airboxes for their ITB kits, so we may buy one of these and modify it to suit the S2000’s engine bay. Or we may build one from scratch. But first, we want to tune the car for the setup you see here and log intake air temps to see if building a box is a worthwhile project.


That wraps up our Jenvey ITB installation. Once we have some fuel injectors from our friends at Injector Dynamics, we’ll get the BADASS2K on the OnPoint Dyno and see what sort of jam the Jenveys make. We can’t wait to hear them scream!

newest oldest most voted
Notify of

I’m curious about the juxtaposition of all this _hard_ custom work for the ITBs, and keeping the A/C?

Wouldn’t the “easy” A/C delete (using the S2000 CR belt) drop a bunch more weight & simplify the engine bay?

(I wondered since I saw the a/c lines squeezed up against your FPR on the crossmember).


I’m looking to do an install on a different car, but was advised against pulling vacuum for the brake booster from the block since all the itbs are going there and that they only create vac, one at a time and the others bleed it away… but rather to tee from one of the itbs before it enters the box… Not sure what to do now..