The T230 was a Ford approved (and marketed) version of the MK1 Focus produced by Gordon Spooner. The engine modifications (inc the T2 and its mapping) were done by Mountune.

Similar to most turbo modifications, except it still used the standard MAF (on the HP side of the intercooler) for a load parameter to the T2, rather than adding a MAP sensor, so it sounds as if some modification has been done (but see below).

As to idle, it still used the standard manifold, so a standard gasket should be right, though an earlier composite gasket could be used, or even silicon.

On a conversion nowadays, most people still use the Ford PCM to control the ICV, it retains the auxillaries load adjustment. Don't know if Mountune did that or used the T2.

Incidently, the T230 T2 is locked. Even if you have the Pectel software, it can't be read or adjusted. Mountune did use standard Cosworth CWT.

Martin