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Super Moderator
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It's because the valves in the mufflers open as the vacuum dissipates with the engine off.
Then as vacuum builds, they close again

C
 

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It's because the valves in the mufflers open as the vacuum dissipates with the engine off.
Then as vacuum builds, they close again

C
No no no. Its TOTALLY different than just sport mode's open mufflers.

Thats the best sound IMO.
 

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Performance Specialist
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No no no. Its TOTALLY different than just sport mode's open mufflers.

Thats the best sound IMO.
Catmanv2 is correct in how he's describing the valve operation... it's just that you're also in cold start mode with the car. The O2 sensors and Cats have not yet warmed up yet, the air injection system is in play, so it's pretty loud for the first 30 seconds on a cold start or so since everything is coming to temperature. It's a pretty epic sound, especially with an upgraded exhaust!

Best Regards,
 
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