So the .21 8 port is a very competitive engine then? How about life span? I've got one that came with my violator, but I have yet to get a bump box for it so I can't run it yet. I've got a mach 28 in my hyper 7 and am not too thrilled with it. Just got done sealing it tonight so I'll try it again tomorrow. Another 21 8 port may be what I replace it with.