Does the Power Tip P1 Reduce Sound Output of a Two Brothers Exhaust?

Does the Power Tip P1 Reduce Sound Output of a Two Brothers Exhaust?  The P1 Power Tip is claimed to reduce sound levels by 3 to 4 dB when mounted to the stock M2 exhaust. We weren’t able to substantiate that claim. We reviewed a Two Brothers M2 Carbon Fiber exhaust recently and concluded that …