1. Durable and reliable. 2. Easy to install. 3. Material: aluminum alloy 4. Product specifications: 16 Flute / 86mm inner diameter 5. Fits for: For BMW 128I, 135i, 135is, 228i, 320i, 325I, 325xi, 328i, 330I, 335i, 335is, 335xi, 428i, 435i, 525I, 525xi, 528i, 528xi, 530i, 530xi, 535i, 535xi, 640i, 740i, 740Li, ActiveHybrid 3, ActiveHybrid 5, ActiveHybrid 7, m325i, M3, M4, X1, X3, X4, X5, X6, Z4. For Volvo, C70, S40, S60, S70, S80, V40, V70, XC70, and XC90.