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C13 is a chord made up of of the intervals 1-M3-5-M7-M9(M2)-11(P4)-M13(M6), theoretically a C major scale. Keep in mind that it is very to common to see a #11(tritone) versus a normal 11(P4). So the notes of the chord would be played: C-E-G-B-D-F#-A.
Now a sus could either be considered as a sus2 or sus4. A sus2 refers to a chord where the 3rd of the chord is replaced by a 2nd, so in a C triad (C-E-G) the E(3) would be replaced to a D(2) creating a Csus2 (C-D-G). A sus more commonly refers to a sus4, so a Csus4 would consist of C-F-G, replacing the E(3) to F(4). Now a Csus13 would replace the E to an F so the chord would consist of the following notes: C-F-G-B-D-F#-A. It would be a very ugly sounding chord none the less, and it is theoretically impossible to play on guitar due to the fact a guitar only has 6 strings.
