The best bet would be to get a Probe Turbo from an I4. Then you can get a boost controller. If not that then go to probe talk and see what they have as far as step-up turbos. The stock ones are fairly small. Consider a step-up.
you can add a turbo to anything as long as you wotch your boost levles. a factory turbo off of any old subaru would be better than the RX-7, the turbo off the RX-7 is tiny. You could get a referb one for around 400$. Or if your brave 25-50$ in a junk yard.
A forum community dedicated to Mazda MX-6 owners and enthusiasts. Come join the discussion about restorations, performance, upgrades, modifications, classifieds, troubleshooting, maintenance, and more!