I want to get some more thump out of my Hyper, but I'm not that worried about looks or performance. I have heard people have cored out their stock cans, but can't find any threads about it. Does this require any grinding/welding? Also, if I have no other mods, will I need a new ECU to get the mix right? Or will I be ok with the stock setup? Also, will I *lose* any power doing this? Thanks in advance.