PRODUCT DESCRIPTION
Generally speaking:
S is suitable for displacement of 1.0-1.6,exhaust pipe diameter 32-43 mm
M is suitable for displacement of 1.6-2.0,exhaust pipe diameter 37-48 mm
L is suitable for displacement of 2.0-2.4,exhaust pipe diameter 44-55 mm
XL is suitable for displacements of 2.4,exhaust pipe diameter 56-85 mm
This product is suitable for all automobile models and brands. We cooperate with
more than 50,000 automobile modification brands around the world 
TURN YOUR CAR INTO A BEAST
5 minutes of installation is Complete
Please check and re-tighten the bolt regularly.
Features:
After installed this product, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system or blow off valve.
Made of high quality aluminum, light weight and durable.
Easy to install on the car's tailpipe . 
Loosen the bolt on the Turbo Sound Whistle.
Insert the the Turbo Sound Whistle into the tailpipe.
Tighten the bolt so as not to fall off while driving.
