It might be lettering, at least I have not seen a matching font. So far, I have found four candidates that are roughly a match for the letters, without the extensions.
If you can edit fonts you could use any of them to make a reasonable imitation.
Sneaker Script http://www.myfonts.com/fonts/flat-it/sneaker-script/
Monoline Script MT http://www.myfonts.com/fonts/mti/monoline-script-mt/
Swing http://www.myfonts.com/fonts/mti/swing-2/
Tribeca Script http://www.myfonts.com/fonts/pelavin/tribeca-script/
Don
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