Well, you don't "need" the EGR. You'll need to tune it out if you do not want codes. There is some fabrication involved if you want to retain EGR. Basically, it would require a divorced EGR mount like the Gen-III trucks used to have, and a custom braket and plumbing modifications to work. Mine's like that and works flawlessly.
2000 Tahoe Limited, 1998 Suburban C2500 LT, 1999 C1500 4-Door Tahoe LT, 1998 C1500 ECSB Silverado LS