I bought a used turbo kit the other day and it came with engine management and a wide-band O2 sensor that I don't need since I have my own already sourced.
Both are used and I offer no support personally, though I believe Bell Engineering will help you out since they are the ones who sold it originally.
Here is a link to the XEDE Engine Management: For 1999-2004 Miata
Xede Engine Management for the 1994-1997 Mazda Miata. BEGI Bell Engineering BEGi
New price: $1,495 from Bell.
Miataturbo.net SUPPORTER price - $445.
Comes with Laptop with tuning software installed but NO fuel injectors.
I am willing to sell it WITHOUT the tuning laptop for $300.
PLX DM-6 Wideband - USED.
New price: Approximately $198
Miataturbo.net SUPPORTER Price: $50
I may add other stuff later, but for now this is all I know that I don't need. All prices are "OBO", but if I don't come close to those numbers I will post an ebay ad at some point in the future with a low/no-reserve but then you will be competing with everyone.
In regard to warranty on the XEDE - There is no warranty because it is highly dependent on the skill of the installer. I am not liable for what it does to your engine, or any of that stuff. Work with BEGI to get a tune that is safe... According to the previous owner it was working properly (he drove the car from Maryland to Illinois on it). It was installed on a 1999 previously.
Any questions feel free to contact me.
*** So what do I mean by "Supporter price"? I mean that If you want to buy it, you must be a supporter. If you are not currently a supporter I won't ship until I see "Supporter" by your name on the site.