A Silverstone Metallic M3 and M4 exhaust sound comparison with valves both open and closed of an AWE Non-Resonated Full Exhaust System on the M4 and the M Performance Exhaust System on the M3.

Valves Open: 0:15
Valves Closed: 0:32

Valves Open: 0:59
Valves Closed: 1:22

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