I went to this site, i never even knew there was other styles similar to muay thai... anyways I read something from that site
http://go.to/stickgrappler:
"Lethwei also known as Burmese Boxing may well be the most brutal form of kickboxing. In many ways similar to Muay Thai from neighboring Thailand. If Thai Boxing is the science of 8 limbs than Burmese Boxing is the science of 9 limbs due to the allowance of head butts."
Hmmm, they do allow head butts in MT right ? I`m kind of confused now !!!