Can the sound or tune of an exhaust be changed or manipulated to sound different, this specifically on a diesel. My 2500 GMC Duramax had an Elk whine sound from the turbo. I changed out the stock exhaust and it sounds better, your able to hear the motor sounding more like a mean 350 gas however it has a strong constant whish, coming from the tail pipe. I think alot of diesel owners like this air turbine sound as if it's cool but I had rather hear the motor rather than this. Is there a way to manipulate the sound by the tips of the exhaust?