Thanks, Please Explain " modded hub"??

Hi Folks, I am just about to start a rebuild of my E34 M30B35 turbo for my E12 project See Here: http://www.bmwe21.net/forum/viewtopic.php?f=74&t=21914&start=105" onclick="window.open(this.href);return false; Decided to strip and build a reliable engine with a goal of 400-450 BHP parts will be: twin ...