Does anyone know if you can buy such a thing and if so where from?

I know MX5 engine tuning is really all about forced induction of one sort or another I'm just weighing up a few options I'm already asking on the MX5 forums as well btw

here's one for sale but in the states

http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Carburation-induction/auction-147007322.htm

more info -

http://www.mx5ocforum.co.uk/viewtopic.php?p=332409&sid=c61160f85107b1f752d7b64bb3923138