The BMW Genuine M Performance Exhaust System Trim in Carbon Titanium (18305B35D87) is a high-quality performance part designed by BMW. This round-shaped exhaust trim is easy to replace and features a matte black finish with carbon material. This screw-on mounting style ensures a secure and seamless installation for a perfect fit. Upgrade your vehicle with this sleek and stylish exhaust tip for a. Sophisticated and sporty look. THIS IS A SET OF 4.