Peter
I have also been in contact with Titan this afternoon,Iain Holiday, and the throttle bodies do look like they will do a good job. The most problematic part, as Gambalunga points out, appears to be the ecu and making sure the driveability, emissions, cold starting etc, are not adversely affected and I like the idea of a properly engineered and tested plug and play kit rather than a one off which I don't have the ability or patience to tinker with. Omex have produced such a kit for the Duratec and Sigma engine and I believe Titan are keen to work with Omex on a GDI version, not sure the enthusiasm is reciprocated though, yet.
I am also very pleased with my not so new manifold/cat setup having now covered 4500 miles since it was fitted although not having any engineering skills unfortunately my setup cost a little more, well worth it though.