Which one is everyone getting? I seen on his website that he has a 30" resonator and 30" resonator/muffler.
Basically only 2 options available.... lots of part numbers due to inlet and outlet sizes as well as material to match your needs [ stainless steel or Aluminized case].
17" unit is termed the "Resonator" when installed at the downpipe it will eliminate the majority of the drone experienced by most users with aftermarket or straight pipe free flowing systems. We state that a 50 RPM range will still tingle in the cab, however the current 300-450 RPM drone concern will be controlled. Tailpipe sound is not much affected.
30" unit is termed the "Resonator / Muffler" when installed at the downpipe will eliminate ALL of the drone experienced by most users with aftermarket or straight pipe free flowing systems. The 30" unit also tones down the sound from the tailpipe, hence the muffler tag.....
Keep in mind that sound is subjective, in life there are blondes, brunettes, and redheads....each doing different things for each of us.
So when deciding what you want or need, simply ask do you want it gone or do you want it better?
Neither version gains EGT's or hinders power....
We have had success on every pickup truck and combination available... 6.6 dmax, 5.9 cummins in 12V / 24V / CR, 6.7 Liter Cummins, 7.3 PSD, 6.0 PSD, 6.4 PSD and even the new 6.7 liter stoker.
as mentioned above, sound is subjective.... when people want to know what it sounds like we can never really answer that.... it's a cab noise control product that was built from the start to control CAB drone on pick up trucks without spark plugs with an average engine displacement of 5.9 Liters.