In Comfort mode it doesn't sound much different than stock. In Sport mode it is louder but not too much. You will get a bassy tone (slightly annoying) when in high gear in the 8 AT when the revs are between 1500-2000 RPM (highway speeds 60-80mph) in D, switching to comfort mode will make it quiet. The tone will change (higher pitch and less loud) if you push the stick to M/S in sport mode as the RPMs are above 2K and the transmission in 7th gear.
MPPSK is not as loud as other after market exhausts. I pretty much have to roll the windows down to fully hear it even in Sport mode with the valves open.
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