S size Suitable for BM&W engine displacement 1.01.6 L; exhaust pipe diameter 3243 mm M size Suitable for BM&W engine displacement 1.62.0 L; exhaust pipe diameter 3748 mm X size Suitable for BM&W engine displacement 2.02.4 L; exhaust pipe diameter 4455 mm XL size Suitable for BM&W engine displacement above 2.4 L; exhaust pipe diameter 5685 mm Product type Universal Car Sound Simulator Car Turbo Sound Whistle available in S M L XL for vehicle tuning and exhaust pipe use What it does The muffler tip decorates the car and protects the exhaust pipe from rain and pollution Helps the exhaust run more smoothly and can contribute to a smoother driving experience and more enjoyable ride Design and style Adds a unique sporty look with a streamlined shape and smooth surface that blends with the car body Use scenarios Upgrading a BM&W vehicle with 1.01.6 L displacement by installing the S size for enhanced appearance and exhaust presence Tuning a 1.62.0 L BM&W vehicle with the M size to match pipe diameter and improve overall look Equipping larger engines (2.02.4 L or above 2.4 L) with X or XL sizes to fit bigger exhausts and achieve a cohesive, sportier profile Notes Ensure your exhaust pipe diameter matches the listed range for the selected size This is a universal sound simulator and whistle designed for car tuning and exhaust appearance and protection