Thank you Palliser and AddeD for the pointer and insight. I think I am truely confuse with the way this is set up. What I am going after at the moment is to just listen/spy on the bus for the traffic. Whether it be OBD2 or vehicle's internal bus I have been able to plug into it via an OBD2 shield in conjunction with UNO or simply a CAN232 without participating as a node and see data flow through. Yes, I am aware of how OBD2 work 
on top of the request and respond the power train CAN in my vehicle contains hundreds of frames per seconds of other propriatary information aside from RPM, speed, temperature, etc. Again, thanks Palliaer I'll give it shot. The OBD2 is at 500 and I had tried them all. Here is another question, how come 100K isn't part of the constants list? Thanks,