It seems like my flowmaster muffler is quieter if i punch the gas then when i ease on it. Why?

my new flowmaster muffler sounds great but for some reason my engine sounds a bit high pitched well if i ease on the gas then it is easy to hear the muffler from inside the cab but if i punch the gas it seems like the muffler isnt that lound and you can hear the engine and its like a bit of a high pitch humming noise? is that normal? does it sound better outside of the cab?|||What you are experiencing is muffler "resonance". I used to have a magnaflow that did the same thing. Basically, when you are just giving it a little bit of gas, you are hearing a different frequency than when you are punching it. So, your exhaust seems louder from inside the cab when you are barely on it because the frequency is basically rattling your frame/cab. But when you punch it, the frequency is much higher and it does not make your frame/cab vibrate as much. I can assure you than when you punch it, people outside will hear it much louder than if you barely tapped the gas.|||i have a greddy and thats how mine is.


im not sure of the real reason, but i think you just hear the engine rev more than the exhaust when youre inside. it sounds a lot deeper when i take my foot off of the gas than when im revving it high.|||it depends on the resonance like one guy said the have series types the lower the number the louder it is example 40 series is louder in the cab than 50 series from my understanding|||it might be something to do with ur battery or engine starter