Doppler Exhaust "S3R Evolution" Yamaha BW's / Slider

The expansion chamber is made of sheet metal (rolled and welded) and coated, the silencer is made of aluminium, available in black or white.

It is street-legal, yet very powerful throughout the entire rpm range. It can be combined with almost all cylinders on the market and is ideally suited for original or 50cc and even 70cc sports kits (even Mid Race!).

To unlock its full potential, you should combine it with a 17.5mm carburetor (in line with the type of cylinder that's used) and a racing variator and clutch.

This is the version with white silencer!

For Minarelli vertical