2001-2016 GM 6.6L Duramax Up-pipes Bolt Set (12pcs)

OEM design with washers. Thread length increased to accommodate washer thickness. Two screws are 5 mm longer to accommodate the downpipe mounting bracket. Our design preserves thread engagement whereas other companies do not. All 12 screws will be alloy steel 12-point screws in black oxide finish, class 12.9. (10) M10 x 1.5 x 32 bolt and washer(12) M10 washers(2) M10 x 1.5 x 37 bolt and washer OEM design with washers. Thread length increased to accommodate washer thickness. Two screws are 5 mm longer to accommodate downpipe mounting bracket. Our design preserves thread engagement whereas other companies do not.