Today I installed the Manta 3inch exhaust to my 2002 GU 3.0L di.
This had the added bonus of letting me clean and refit my EGT gauge which had not been working.
On a test drive I found the idle temp (once at operating temp) was 140 - 160. On the road at constant speed it was reading 220'ish. I didn't have any substantial hills to climb for a test reading.
Is this in the ball park for this model?