what 1 should i use?

4" Air Intake MAF Sensor Adapter
http://www.spectreperformance.com/mo...ages/81403.jpg

3" Intake Duct Mounting Plate
http://www.spectreperformance.com/mo...mages/8148.jpg

if i remember correctly, neither would work for the MAS on the 9g.

correct....

Wait...I thought u had a 7G?

correct.