It definitely sounds different on the overrun, more pops and bangs than before.
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nice video from Paddon
https://www.youtube.com/watch?v=7Xz6DcDs8lc
Αbbring flat out
https://www.youtube.com/watch?v=i55A-EQZb-Y
Hyundai Neuville & Sordo + incar
https://www.youtube.com/watch?v=MnvjNO2ETIM
and here is one with much longer onboard
https://www.youtube.com/watch?v=NY4lO7-hLRI
Also M-sport
https://www.youtube.com/watch?v=RLi2i3Cviwc
Breen on it during his Wales PET !
https://pbs.twimg.com/media/CTZPWrsWcAAVVHe.jpg:large