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Look inside your glovebox at the list of codes. If you see G90 then you have 2.73; if you see G92 then you have the 3.15.
If you can't find the code then put the car in 3rd gear on the highway at 75 mph. Take the tach reading and divide by 1000:
3150 rpm = 3.15
2730 rpm = 2.73
Crash...
And let me be the first to welcome you the the Forum. You'll love it here, but be forewarned: mod fever is rampant around here and it's highly contagious. :cheers: