I will be installing big bore 800 kit on my 2005 M7 EFI pretty soon so I have several questions in my mind that could help me with my project. After 800 kit, do I need to change the stock single pipe from 700 to stock single 800pipe?, should I install an EGT and what is the best location on pipe to install probe on single pipe? And, I came across so many different EGT's from avaition, automobiles, snowmobiles, etc etc so wonder if any of them will work on snowmobiles? I did some research and seems to me that snowmobile egts cost twice or triple over automotive egts even thou the probe and gauge looks similiar but different in designs........