This is what makes the difference between a hacked together car and one that feels like a factory effort: integration. Modern cars are engineered as complete platforms, not just an engine attached to a dumb chassis. The steering talks to the headlights, the start button talks to a range of different systems and the dashboard communicates digitally with everything. Even something as simple as the fuel gauge can offer up surprising problems.
We have spent a couple of years deep in the ND Miata's networks, working with our partners at MRS Electronics. We've managed to retain almost every aspect of the ND's systems so the car looks and acts like it was built with a V8 from the start.
At the time of writing, we were still working on implementing stability control. Traction control (ie, wheelspin) is not planned. Cruise control is not currently implemented but this hardware has the capability of communicating with an aftermarket cruise system.
The core of the whole thing is the gateway. It blocks some signals, passes some through, translates some from GM to Mazda or vice versa and provides software simulation of entire subsystems that had to be removed. It does depend on a steering column angle sensor that is found on the GT and GT-S models, this will have to be retrofitted to Club and Sport models. We have not datalogged a Fiat 124 to see if the Mazda programming will do the job, but we can do that if you are planning a V8 Fiat.
The battery relocation kit is required to make room for the engine. It includes a trunk-mounted kill switch as well as an underhood jump/charge point.
Not included are a number of wiring bits and pieces that you can easily pick up elsewhere - butt connectors, heat shielding, etc. The kit also does not include the battery or hold-down so you can use the size and type of battery you prefer. We recommend using an Odyssey PC925T and the matching Odyssey bracket, available all over the place.
Note that the gateway will be programmed with the latest version of our software right before shipping, so it may be delayed by a day or two before it leaves our shop.