on JohnnyN's vectra the 2.4 tb gave more power than the 2.4 inlet manifold did.
I must explain why....the inlet manifold was the biggest restriction on the inlet system, when the 2.4 inlet manifold was fitted the restriction moved to the 2.2 tb, when courtenay fitted the 2.4 tb the restrictions were removed and the full power gains could be seen showo..
If I fitted a 2.4 tb to mine I would probably loose power, as the 2.4 tb is smaller than my current 2.0 sc tb
2.4 tb = 65mm
2.0 sc tb = 68mm