My RC45 came with a carbon fiber HRC race exhaust, its not loud at all compared to the aftermarket stuff they put on their bikes. Those are just noise makers, they don't realize, non turbo engines need the back pressure to scavenge. They would rather live with loud noise than low end.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT