I just spoke with Orient Express in Brentwood NY a few days a go and they do have the M21-003 for the roadster in stock. Phone# 631-231-9552. Have a good one!
fuelmoto in neenah wisconsin is a great source. jamie and keith have built quite a successful business with aftermarket tuning, the pcv and there's a newer version out now, and they sell them. fuelmoto is what you can google to find their website. they can send it to you pre mapped and they also have a new version that reads your sensors and will self tune. i hope this helps.
PC5 is a tuning module that will allow fuel adjustments to obtain appropriate AF ratios on the output of the ecu to engines that have been modified for better airflow (intakes-exhausts) resulting in increased power and avoid leaning out. You can find more info by checking out the Power Commander website and do a search on this site to get valuable info on the experience of PC users as well as other tuning options such as tune boy and tune ecu that involve ecu remapping. They offer more functionality but have their own pros and cons as does the PC5. Enjoy the day.