Quote:
Originally Posted by raptor5244
There is more to it during cold start. One of the reasons the exhaust is louder is that during a cold start the timing is retarded to meet emissions standards, etc.
When it is colder out you may notice it to be even louder as more timing is pulled during a cold start. Once the engine temp starts to rise you notice it start to come off high idle and the ECU adds more timing, which affects the exhaust note.
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Have you logged timing to verify this?
Engines are more efficient with more timing advance, to a degree...(no pun intended)
