I deleted my EGR when I put my long tubes on. It really cleans up the engine bay too. I bought a block off plate from UPR (link below). It was a simple install. I just cut the EGR pipe off since I was never going to reuse it.
You will need a tuner to turn off a check
engine light if you do this.
UPR 99-04 Mustang EGR Delete Plate - Free Shipping Over $149
2000 Gt- Vortech V1 10psi, 4.10 gears, SLP LT headers, Magnaflow cat-back, Eibach pro-sport suspension, MM subframes, 78mm plenum and throttle body, lots of cosmetics, and more