The two trucks sound like exhaust leaks to me.... NASTY...
The Borla sound is deeper and richer.... and they don't have the dreaded drone while cruising.
The Flowmasters have a "raspier" sound... A bit more "mechanical" sound.
The MagnaFlows are deeper and richer sounding than the Flowmasters...
I think a lot of the sound is not only brand specific - but model specific within a brand -- i.e., Flowmaster 50's sound way different than Flowmaster 40's... but also diameter of the exhaust -- placement - and compression/camming of the motor. A wimpy ass motor is going to be wimpy sound regardless - and a cammed up motor is going to sound pretty good regardless. X pipes change the sound - Resonators can change the sound.... The length of exhaust AFTER the muffler can change the sound.
Ferrari actually has an entire department that does nothing but work on the exhaust for their cars... they want that "signature" sound.
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