Description: This is for GM Gen III/IV LS engines (LS1/LS2/LS3/LS6/LS7). The tubing is from high-quality 16 gauge 304 stainless steel, with CNC machined flanges and TIG & MIG welded construction. Features Primaries Diameter: 1-5/8 in. (42mm) Collector Diameter: 2-1/2 in. (64mm) Pipe Thickness: 16-gauge (1.5mm) Fully mandrel bent tubes made of 16-gauge 304 stainless steel Head flanges laser-cut from 3/8-inch thick steel plates Fitment For LS motor swap on older Chevy, GM, Pontiac, Olds, Buick models

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