Anyways here is the exhaust pipe size chart that i looked at that says a 360 engine putting out max torque at 4750 is fine with 2 inch diameter exhaust pipe.
Two things. That guy is always a point of contention with inaccurate information. A lot of the stuff on his early Hemi pages is just wrong as all hell. Second, as stated above, that chart is not exhaust pipe diameter, it is header primary ppe diameter. You need to start listening to those here. You asked HERE. You have gotten good answers. Use them instead of arguing.