Prevent exhaust from entering the intake. Normal operation is exhaust sucked in by egr for reburning of unburnt fuel and also warms the air goin in to cool down the cylinders as cylimders run at 1500 degrees intake air enters around 150 or so. Pretty much egr delete im my perspective keeps the cold air coming in cold. However im waitin on cliffyk to chime in and give the full description and y we have it and benefits of deleting he explains and breaks it down much better than i can
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.