[856SS]

Hey guys. New to this forum upon purchasing my 18 1SS 3 months ago. I recently had a mbrp race series cat bat installed and i just purchased kooks 1 7/8 LT’S w the offroad pipe because who needs cats anyway. Plan on doing the install myself as long as theres no welding involved. Could someone please let me know how much of a headace this would be and if im going to have to weld it? Thanks in advance!