I have the Thermal system and love it. I will admit at times I wish it was a LITTLE louder but those times are very rare. It by no means is quiet, its much louder then stock thats for sure. Let me put it this way, once you install it and first start it up you'll immediately hear a difference, even in the drivers seat. The reason is "quieter" then the other systems is because it still has a muffler and resonator and I'm sure the "resonator" is actually their "Helmholtz" system. But even then I still consider it loud even with all that still on it.
One thing I look for in exhaust is that it has little to no drone, which the Thermal is bang on with that. NO drone at cruising speeds. Second is that it keeps its composure throughout the rev range and doesn't go raspy/farty at wide open throttle. I can't emphasize on how the Thermal still sounds great even at wide open throttle, I realized this when I had my good friend drive it next to me.
You won't regret the Thermal I can promise you that.
Here's a video Thermal made explaining what the "Helmholtz" system is.
https://www.youtube.com/watch?v=j3iA_UtUWt4
One thing I look for in exhaust is that it has little to no drone, which the Thermal is bang on with that. NO drone at cruising speeds. Second is that it keeps its composure throughout the rev range and doesn't go raspy/farty at wide open throttle. I can't emphasize on how the Thermal still sounds great even at wide open throttle, I realized this when I had my good friend drive it next to me.
You won't regret the Thermal I can promise you that.
Here's a video Thermal made explaining what the "Helmholtz" system is.
https://www.youtube.com/watch?v=j3iA_UtUWt4