Hello. You should have the Z22SE engine, the later direct engine came out in the Vectra C and the new Zafira & Signum. I think the newer direct engine has 155 Bhp standard. I have heard the direct engine was made for better economy what.. . Here is a spec list of the Direct 2.2 engine..
Performance
0 to 60 mph (secs) False
0 to 62 mph (secs) 9.7
Engine Power - BHP 155
Engine Power - KW 114
Engine Power - PS True
Engine Power - RPM 5600
Engine Torque - LBS.FT 162
Engine Torque - MKG 22.4
Engine Torque - NM 220
Engine Torque - RPM 3800
Top Speed 134
Hope this info helps 🙂