h-pipe for 98 gt

i am new to the 4.6 stuff.i found a guy that has an offroad h with o2 sensors,i think he said it has 4 o2's,is this right?my 94 has 2 and i cant imagine why the 98 would have 4.also,will my check engine light come on if i run this h w/o converters?if so,what can i do to get it to go off?i know the x pipe is better than the h,but at this price i cant pass it up.also i keep getting the check engine coming on,pulled the codes at autozone came up 1150 and 1151.what needs fixed to stop this?can you guys help 5.0 guy out alittle.i found this car for 4200 bucks and i said what the hell.i wanted to see what these cars are all about.the only other 4.6 i drove was a bullit.it was a blast thats why i bought this car,that and the price.thanks guys

94?its not going on a 94,why would i try to put it a 94?read the thread title.its for a 98,its going on a 98.i just want to know if im gonna get the check engine on and,if so,what can i do to get it to go off?and what those codes were that i pulled and what i need to fix to quit getting them

im already getting one today bbk with o2 sensors for 50 bucks.so i need mil eliminators to get the light to go off?thanks thats what i needed to know.