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There seems to be a lot of talk going on about the possibilities of upgrading to different turbos, and I have to be honest I'm left in the dark. I guess I know the difference between K03s and K04s, but that's really about it.

Anyone fancy explaining the differences between available turbos in more detail?

Yup. Cuz I don't even really know the real differences between K03 and K04's - only that K04's are more reliable and more powerful!

same here, there was all the talk of K03 hybrids as well to add to the equation for those not aiming for mega power increases

It's all about size and flow. and of course money.

The larger they are the more air they flow so the more power they can produced.

That's the point I'm making. The K04 has larger ports and turbine than a K03 so it can flow more gas. That's easy. But I keep seeing references to special versions of the K04 and I'd like to learn more about the differences.

Take a look on http://www.buehnengineering.com/27t.htm

The options are explained well.