[Cobra #3170]

Has anyone on CC tried the new Flowmaster mufflers (12114071) for Cobra side pipes? They are a relatively new product that is made at their R&D facility in Idaho. I am getting so many complaints about the noise level of my car that I am going to have to do something to reduce the sound levels. I cannot even run at most autox venues now because they have dB limits, much less Infineon or Luguna. They told me I would lose some power with these mufflers but that I should be able to pass Infineon sound limits. Are they a double pass design or something else? The drawing shows a 4.5" outer shell diameter with 3.5" inlet and outlet with an OAL of 35" and a muffler length of 30". The dimensions are almost identical to my Stainless specialty mufflers. I really wouldn't mind losing 75 to 100 Hp if I could get this thing to acceptable noise levels for some events.