12 X BMW OEM Copper Collar Nut 7mm Exhaust Manifold to Cylinder Head for 128i 318i 318is 318ti 320i 323Ci 323i 325Ci 325i 325is 325xi 328Ci 328i 328xi 330Ci 330i 330xi 525i 525xi 528i 528xi 530i 530xi M3 M3 3.2 X3 2.5i X3 28iX X3 3.0i X3 3.0si X5 3.0i X5 3.0si Z3 1.9 Z3 2.5 Z3 2.5i Z3 2.8 Z3 3.0i Z3 M3.2 Z4 2.5i Z4 3.0i Z4 3.0 Made By O.E.M. Copper Collar Nut (7 mm) - Exhaust Manifold to Cylinder Head Manufacturer Warranty: 12 months or 12000 miles Please see Product Description Below for Vehicle Compatibility