This is a Miata part if you're willing to cut it and get someone to weld it to a cut Miata IM flange/runners as discussed in this thread:
This is the Blox Skunk2 replica, and has a larger plenum shaped for more equal distributions. Flows to 8200rpm on Honda B16/B18 thingies.
I'll never get around to finishing this project out, and want to buy my daughter a kayak to take her out on the lake with. Tired of being in garage with a car that constantly gives me crap and always fails me, so I'm leaving it as-is and just keeping it running.
Manifold is in the top of this picture, compared to a B6 mani:
And on the right, same comparison:
Looking into plenum you can see the better entry into the runners
$125 plus shipping OBO
I also have a 60mm B18 throttle body that mates up to it that I can include for another $25, and a B6 manifold if you have a 1.6L and want to minimize downtime. For the mani I'd just ask $20 and that you cover the extra shipping weight.
This has potential for those of you who want to make more than 230ft-lbs of torque and are seeing torque drop off at high rpms.