Chrispoe, do you know of anyone doing regrinds for single cam B6's.
Jack Byrd
Are you talking a cam for a SOHC B6? Seems kind of pointless on an anemic SOHC head...LOL
Colt cams and Delta cams do Miata cams, and I'm pretty sure they will also regrind any cam you want.
The only cheap intake cam upgrade would be using the 94+ Mazda MX3 exhaust cam and using it as an intake cam. It adds about 10 degrees of duration and the turbo Miata folks seem to like em.
As for the exhaust, the Capri's N/A B6D cam will shift the power band lower in RPM range than a XR2's. If you swap a Miata cam in, it will move the power band higher into the RPM range.