mugen mt12
 

Hey guys, i just bought a used mt12 and a collari xs .12 3port and when i got them i took them apart and the sleeves and cranks have been modded i think. The sleeves look like they have fangs on the ports and the cranks have a groove cut in that go from the center out. do these kind of things increase power and rpm? Can anyone tell me what these kind of things do?