What exactly do you think thermal does so specialš§ it's pipe with mufflers and resonators. There is only so much sound manipulation that can be done. Their quality seems top notch sure, but there's not a huge range in tone differences between exhaust systems with similar setups (muffler and resonators placement). But hey remain skeptical, that's like totally your right man!
What exactly do I think they do. Perhaps you should read up on Hemholtz filters and noise cancellation. Specifically in the fact that a lot of exhausts for our cars drone at certain frequency and Thermal actually did research to pinpoint the drone and design a Hemholtz filter specifically for the exhaust.
You would do good to read up on Clint Beastwoods on experimentts with this as well and his own first hand research here and conclusions.
There is science behind this and its not as simple as you think if you really want a nice exhaust that really does not drone at any freq.
As a trained sound engineer who works in music I know all about unwanted frequencies and the desire to eliminate them . Lol
Its actually pretty amazing that Thermal adapted Hemholtz filters for use in automotive exhaust systems. Primarily the only place that one would come across them is in studios or concert hall situations.
I will drop the basics on you though. A Helmholtz filter is a tunable filter device that allows one to target and tune out specific frequencies thereby getting rid of them. Quite often Helmholtz filters can be used to eliminate unwanted bass freqs, which drones actually do fall into into as they are usually just below low mid bass frequencies. Which can be quite annoying to the average human ear over time. Lol
