Ita actually a 1 7/8" inlet. but if you look closely at the inlet it has a 3 step to it. cut it at the last step and expand as much as possible and you should be able to weld a 2.5" tube to it. i spoke with bob at length on this and we felt for the price it was worth the gamble.
bob you rock!! mine was supposed to be here yesterday but the darn storm messed them up!. cant believe only 6" of snow keeps fed ex at home!! maybe today it will come. it looks great! i have the x pipe coming also