Part #: IEW-1625EHCD41S Size: 1-5/8" Color: Material: Stainless Steel icengineworks Series 1625EH Collector Dummies for 1-5/8" OD Header Assembly are designed for replicating formed or rolled exhaust collectors. By clamping, spot welding or bolting down the CD in the space reserved for the exhaust collector, builders can confidently design the exhaust header runners with precisely defined end points. During fabrication, the CDs will guide the proper alignment and trimming of the metal sections prior to actual welding.