Quote:
Originally Posted by m4a1mustang
The reason the car is louder when it's cold is because the ECU is bumping up the idle RPM by a good bit to help get the fluids pumping and warmed up quickly.
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I know it does that but wen you drive off it sounds much louder through acceleration as it used to have a rasp when cold as the cats got warm the noise decreases significantly...
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09 7AT Touring 370z, Pearl White, Evo-R Carbon Fang Cover, Carbon Top Cover, HKS Centre Pipe, Illuminated Kickplates, Custom Sprayed stock RAYS 
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