Any gains from fitting an escos T28 to an RS turbo?

Been offered a tubular manifold with T28 on it, full system with 5" pipe, probs change the pipe to a 3" outward rolled at some point.

Just wanted to know if it would be worthwhile fitting it?

Not clued up on the Ford range will start my research tho

Am also looking to get a chip & FMIC, its running 140bhp on std boost at mo, any ideas what i can be looking for once these changes are made?

many thanks.