Pacific Performance 316119504 PPE for 2004-2007 Ford OEM Replacement Up-pipes Square EGR Cooler (Short Spout) Bellows are internally sleeved for increased flow Stainless Steel 11-gauge .120-inch wall diameter Up-Pipes 2004-2007 for use with Square EGR Cooler PPE Up-Pipes have more robust, high flow bellows, as seen below in this PPEto Stock comparison.