The Voyagers have 2 round plates welded into the inner core of the mufflers. These can be removed and will allow the mufflers to be less restrictive. This will allow the engine to breath better which will result in a bit more power/torque, better throttle response, a bit better gas mileage, a smoother and a bit coler runnin engine. This will slightly increase exhaust sound but it is a nice tone and not as loud as aftermarket mufflers.
A win win modification that is much cheaper than those aftermarket mufflers.
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