GT/GTS: When the Stock Exhaust Starts to Sound Loud
A change in the sound of your GT or GTS exhaust may be a sign that your graphite exhaust gasket/collar is crumbling or has disappeared. Do not ignore the issue; have it checked out or replaced.

If your exhaust becomes louder, very hot and corrosive exhaust gases are circulating around under your scooter and may cause critical parts such as your rear brake line to fail.
Related MV Threads
Replacing the gasket: Muffler Bearing Installation

GTS brake failure: Rear Brake Question

GTS recall: US Exhaust Bushing Recall

Using the brass gasket vs. the GTS recall kit: GTS250ie brass exhaust gasket

The brass gasket, reconsidered: GTS250ie brass exhaust gasket AGAIN

GT brake failure: Rear Brake Failure on GT

Solving the problem by replacing the stock exhaust with an LV pipe: Official Leo Vince GT/GTS exhaust thread.
A Cool Look inside the Muffler
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