want to know if i need a cross member on my rex to run or drive daily,have a 4-1 jdm itr headeron it...

 

yes you do need it, i just put my 4-1 header on yesterday and i had to cut the crossmember a little bit and bend it in, it sucked because everytime i put it on i had to take it back of cuz i didnt cut enought off

 

You can run the stock one, but you will probley have to cut a notch in it to fit the 4-1 header.