Cold start, what's your idle?

Hello.

I have owned 4 S54 cars but I cant remember if the idle was the same on the M3's?

When I start my car when the engine is cold the idle is around 1100-1200 RPM for about 30 seconds until it goes about normal 900 rpm.

The reason I am thinking about this is because I fitted Supersprint Race exhaust so the car sounds so much that I wake every nighbor every morning, haha :) when the idle has settled its almost quiet.

I dont remember the idle with the OEM exhaust.

Is this normal? 21K miles on the car/engine.

/Filip
 
about 1200rpm for me then gradually reduces over the next minute or two. If I drive the car straight away it can shudder in second gear at low rpm, again for the first minute or two.
 
Yes over 1,000 rpm on start, and a deep rumble. Then it calms down to around 900rpm after a couple of mins


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