Modded BMW M5
http://www.youtube.com/watch?v=uvZCYH37DBQ
http://www.youtube.com/watch?v=AvUMa...elated&search=

Ferrari 355 GTS
http://www.youtube.com/watch?v=XeRJw8VJWjg

Amazingly quite Audi R10 TDI, this is a turbo diesel and it doens't sound great, but you can barely hear it!
http://www.youtube.com/watch?v=ChGGWY_CwO0
This shows how quiet it really is.
http://www.youtube.com/watch?v=le0YDuGwq2k

'90 Audi IMSA GTO
http://www.youtube.com/watch?v=UsMQRRVPmDw
Quattro S1
http://www.youtube.com/watch?v=ArPgSDVWFsU

Tuned Lambo Countach LP500S
http://videos.streetfire.net/search/...7f008f3867.htm

SBC, HCE LT1
http://videos.streetfire.net/search/...e2015e3285.htm

Zonda F
http://www.metacafe.com/watch/321610/zonda_f/


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Post your own if you got something you like.