We present new large-scale R-matrix (up to n=4) and distorted wave (up to n=6) scattering calculations for electron collisional excitation of Fe XIII. We aim to provide accurate atomic data for the soft X-rays, where strong n=4-n=3 transitions are present. As found in previous work on Fe X, resonances from within the n=4 levels and cascading from higher levels significantly increase the intensities of these lines. We provide a number of models and line intensities, and list a number of strong unidentified lines.