See my post on the other forum.
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VWwA Super Moderator
See my post on the other forum.
Volkswagen Fan
I've noticed that from cold the ECU map for warm-up it will raise the idle (you might notice on the rpm gauge) and enrich the fuel (you can smell it). This puts the engine RPM at an acoustic sweet spot which makes it sound boomy. Remembering also there's that stupid sound actuator mirroring the engine rpm. The combined effect is the boomy sound you hear. You can use your foot and raise the idle to the same level and get the same effect.
/10c
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