Is it possible to have CC on a 1.6 16V Stilo...three or five door? Or is the engine completely uncompatible?

What's the year and spec (active or dynamic?) ....... There's a good chance the 1.6 did?

I'm looking at bog standard Actives mostly. A Dynamic pops up here and there.. I'm asking more in the way of aftermarket install as on the JTD. Is it possible to do?

Yes it is possible, all in the main CC thread.

2002 52 plate 1.6 Dynamic I fitted one to a year ago was predisposed, simply plug and play