I second rich on this one, I also have the ARK DTS w/o HFC and it is 100% flawless. makes arguably the best deep growl of any exhaust available, zero drone. you can hardly hear it if your cruising at 65 on zero incline unless you get on it a little. and it doesnt make that wheezing rasp noise when you let off the peddle. also it makes a nice gurgle/pop sounds on decel kinda like a Mercedes AMG. Makes it sound very aggressive and mean.
but, its a different animal under load. if you accelerate hard it goes from quiet....... to OMFG loud. echoing off buildings and nearby cars. its about 104 db roughly under load. and they claim 89 at 3k, which is probably about right.
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