MGM compro can supply their esc's with several cooling options. 1 or 2 heatsinks, extra fans (1 or 2) in combination also with heatsinks, watercooling and a 'cubicstyle' version. With a good setup normally the heatsinks will be enough. A pdf-file with information on cooling can be found at the site of MGM-compro:
http://mgm-compro.com/pdf/controller...s-h.pdfhttp://