John, I think Mazda may have tried or introduced a double injector system, with the usual DFI in each cylinder and an additional injector in the inlet manifold to inhibit, or more correctly, wash the sludge out of the inlet tract and cleaning the backs of inlet valve heads as part of the process before it ends up in the combustion chamber..?
With 993`s being the age they are, corrosion is ever likely to be the issue. Windscreen surrounds front and back tend to bubble up and rear chassis legs corrode rather badly too, A glossy coat of paint can hide some shoddy repairs, air condition maintenance can be expensive too.....
My only claim to fame is that I was the first private individual in the UK to drive the then new to market 993, when I was invited along to it`s launch at Cameron House Hotel on Loch Lomond...
Quite the best 993 video on the model I have come across is this one all be it with a US bias, but this chap really knows Porsche...
