Ferris Bueller's Day Off : Why didn't they hear the Ferrari's exhaust?!

Why didn't they hear the Ferrari's exhaust?!

As it tore ass out of the parking garage Ferris, Sloan and Cameron just kept walking on the street. Cam should have at least known the sound of his own car, hana!

Bing.. Wobbledy wobble, wo-wo-wobble, wobbin'
https://vocaroo.com/1hz4nrSop8zd
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